FIVE O ONE Members Profile 2026 | Kim Hyunjoong, Heo Youngsaeng & Kim Kyujong Complete Guide

FIVE O ONE (파이브오원) is the K-pop group you probably didn’t know you needed back in your life — but now that they’re here, it feels like they never left. Born from the legendary SS501 legacy, this South Korean boy group officially formed on May 1, 2025, under HENECIA, and made their debut as FIVE O ONE on December 18, 2025 — the 20th anniversary of SS501’s debut. Their debut single? A warmly nostalgic “Last Christmas” that practically wrapped two decades of loyalty and love into a three-minute song.

If you’ve been following K-pop second-generation groups, you already know what SS501 meant to the Hallyu Wave in the mid-2000s. Kim Hyunjoong, Heo Youngsaeng, and Kim Kyujong — the three FIVE O ONE members — are all original SS501 members who rose to fame with iconic hits like Snow Prince, Love Like This, and U R Man. Together, they’ve sold millions of records globally and earned a devoted fanbase called Triple S that has waited patiently for over a decade.

So what makes FIVE O ONE worth your attention in 2026? Simple: these are not newcomers riding a nostalgia wave. They’re seasoned artists who have spent the hiatus years sharpening their solo careers — as singers, actors, and performers — and have come back stronger and more musically mature than ever. From their 20th Anniversary World Tour that swept through Seoul, Tokyo, Osaka, and Hong Kong, to their 2026 album “Set It Off”, FIVE O ONE is proving that some things only get better with time.

In this guide, you’ll get the full picture: band background, member profiles, discography, music videos, live performances, and everything you need to know about their 2026 world tour schedule. Let’s dive in.

FIVE O ONE is not just a reunion — it’s a reinvention. Here’s a quick overview of who they are and where they come from.

FIVE O ONE debuted on SS501’s 20th anniversary as a three-member unit built on two decades of friendship, music, and shared history. Formed under Kim Hyunjoong’s label HENECIA, the group’s name is a nod to the original SS501 name — “Superstar Singer, 5 Members 01 (United as One)” — now adapted to reflect the trio’s renewed bond.

• Official Group Name: FIVE O ONE (파이브오원)
• Also Known As: SS501 (original group name)
• Fandom Name: Triple S
• Fan Color: Pearl Light Green
• Label / Agency: HENECIA (Kim Hyunjoong’s company)
• Formation Date: May 1, 2025
• Official Debut Date: December 18, 2025 (as FIVE O ONE)
• Original Debut Date: June 8, 2005 (as SS501 under DSP Media)
• Origin: Seoul, South Korea
• Number of Members: 3 (Kim Hyunjoong, Heo Youngsaeng, Kim Kyujong)
• Genre: K-pop, Dance Pop, R&B, Ballad
• Years Active: 2005–2010 (as SS501); 2025–present (as FIVE O ONE)
• Official SNS:
  • Instagram: @fiveoone_offcl
  • X (Twitter): @FIVEOONE_offcl
  • TikTok: @fiveoone_offcl
  • YouTube: @FIVEOONE_offcl
  • Facebook: FIVEOONE.offcl
• Official Email: five.o.one@henecia.co.kr

The FIVE O ONE Member Profiles

Member Overview Table

1. Kim Hyunjoong (김현중)

Kim Hyunjoong is the kind of multi-hyphenate talent that makes you wonder how one person has time to do it all. He’s the leader, main dancer, vocalist, rapper, and the undeniable face of FIVE O ONE — a role he’s held since the very beginning of SS501. Beyond music, he’s a recognized actor, songwriter, and even entrepreneur (founder of HENECIA). If FIVE O ONE had a captain, it’s him, and every fan knows it.

Kim Hyunjoong

He can play guitar, bass, piano, and drums — a true one-man band before he was part of one.

In 2008, he starred in We Got Married with rapper Hwangbo, creating one of the most beloved TV couples of the era.

His role in Boys Over Flowers (2009) shot him to acting fame, earning him two popularity awards and turning him into a major Hallyu star.

He became a brand ambassador for cosmetics companies Tony Moly and The Face Shop after Boys Over Flowers — their sales reportedly spiked when his face went on the packaging.

He founded HENECIA, both his solo fandom name and the company that now manages FIVE O ONE.

His solo debut mini-album “Break Down” (2011) topped South Korea’s Gaon Weekly Album Chart and earned platinum certification in Taiwan.

He has two sons with his wife.

His favorite colors include blue, red, white, and black — pretty much the whole palette.

His hobbies include basketball, swimming, and soccer — clearly not a man who sits still.

He received the Best Asian Artist Award at the Asia Song Festival in 2012 and won Best Male Solo Artist at the Mnet Asian Music Awards in 2011.

2. Heo Youngsaeng (허영생)

If you’ve ever heard a FIVE O ONE ballad and felt like your heart just quietly floated out of your chest, that’s Heo Youngsaeng at work. As the main vocalist, he’s the emotional core of the group — the voice that makes the quiet parts of a song feel like the loudest moments. He’s also the only child of his family and carries that singular intensity into every performance.

Heo Youngsaeng

He trained at SM Entertainment for 2.5 years before moving to DSP Media — meaning he once practiced alongside what would become the TVXQ and Super Junior generation.

After joining DSP Media, he only trained for 3 months before debuting with SS501. Talk about a fast track.

He lived with Kim Jaejoong (TVXQ/JYJ) during his SM trainee days, and the two remain close friends.

He’s an only child — a fact that might explain his self-sufficient, independent personality.

He once took an IQ test and scored 121 — smart enough to know exactly how to deliver a heartfelt lyric.

He is absolutely terrified of cockroaches. One of the toughest vocals in K-pop? Still no match for a bug.

He had a throat surgery in 2006 — just one year into SS501’s career — and came back stronger than ever.

Some of his favorite K-dramas include Crash Landing on You, Goblin, and Vincenzo — excellent taste.

He likes playing soccer, a hobby he shares with bandmate Kim Hyunjoong.

His solo debut song “Let It Go” (2011) kicked off a strong solo career with hit tracks like “Crying”, “The Art of Seduction”, “Weak Child”, and “1.2.3”.

3. Kim Kyujong (김규종)

Kim Kyujong is the maknae (youngest member) of FIVE O ONE, but don’t let that fool you — he brings serious energy to both the rap line and the vocal line. As the main rapper and vocalist, he adds a dynamic contrast to Youngsaeng’s softer tones and Hyunjoong’s powerful presence. Off-stage, he’s known for being a genuinely warm, food-loving, and artistically creative person.

Kim Kyujong

All he thinks about is food — at least according to his members and friends. And honestly, same.

He can cook a solid Korean Chicken Soup (dak guk), barbecue, and curry — that’s three different cuisines covered.

He has a younger sister, making him the protective older brother type at home and the youngest at work.

He wants to marry someone his parents would approve of — a rare and sweet quality.

His parents married without his grandparents’ approval, and Kyujong grew up wanting to honor his family by doing things the right way.

His solo debut single “Yesterday” (2011) reached No. 53 on the Korean charts, and he continued releasing music through his “Play in Nature” series in 2017.

He runs an art-focused Instagram account (@kimkyujong_art_o), reflecting a creative side that goes well beyond music.

He collaborated with Heo Youngsaeng on the track “O.K. – Why Are You OK?” (2020), keeping the SS501 spirit alive even during the long hiatus years.

During his SS501 days, he contributed the Japanese solo track “Hikari” (光, meaning “light”) — a moment of beautiful simplicity from the group’s Kokoro album.

As the maknae, he’s always had a warmth and playfulness that makes him the unofficial mood-maker of the group.

Achievements

FIVE O ONE — as SS501 and as a unit — has built a legacy that stretches across two decades, two countries’ music markets, and generations of fans. Here’s what they’ve accomplished:

As SS501 (2005–2010):

• Debuted on June 8, 2005 under DSP Media with their first EP Warning, which included their first No. 1 song, “Never Again.”
• Won multiple Best New Group awards in 2005 and 2006, right out of the gate.
• In 2007, expanded into the Japanese market with the single Kokoro, which debuted at No. 5 on the Oricon chart.
• In January 2008, became the first South Korean artists to win the Newcomer Award at the Japan Gold Disc Awards — a historic milestone for Hallyu.
• Grew a massive fan base in South Korea, Japan, Taiwan, Southeast Asia, and beyond.
• Released landmark tracks including Snow Prince, Love Like This, U R Man, 4Chance, Because I’m Bad, and Song to Call You.
• Kim Hyunjoong starred in Boys Over Flowers (2009), one of the highest-rated K-dramas of its era, earning the Baeksang Arts Awards Most Popular Actor award and Seoul International Drama Awards Popular Actor recognition.

As FIVE O ONE (2025–present):

• Formed in May 2025 as a 20th Anniversary special project under HENECIA.
• Held the 20th Anniversary World Tour across Seoul (Olympic Hall, July 2025), Tokyo, Osaka (NHK Hall, September 2025 and January 2026), and Hong Kong (AXA Dreamland, January–February 2026).
• Released the debut digital single “Last Christmas” on December 18, 2025 — the exact 20th anniversary of SS501’s debut.
• Released their first album as FIVE O ONE, “Set It Off,” on March 7, 2026, which saw all 14 tracks chart on Spotify’s Weekly Top Song Global for three consecutive weeks, with 13 of those songs remaining on the chart.
• Held the World Tour Encore Concert at KBS Arena, Seoul (March 7–8, 2026), marking the triumphant close of the world tour.
• Kim Hyunjoong individually holds 34 award wins and 40 nominations, including trophies from the Mnet Asian Music Awards, Asia Song Festival, Baeksang Arts Awards, and more.

Discography and Music Videos

SS501 Discography (Group)

FIVE O ONE Discography

Key Music Videos

• “Last Christmas” (2025) — Warm, lyrical piano melody; features a separated couple at a crosswalk intertwined with memories. Released on the group’s 20th debut anniversary.

• “Set It Off” (2026) — Title track of the debut album; first performed live at the KBS Arena Encore Concert in Seoul, March 7, 2026.

• “Flower” (2025) — Pre-release during the 20th Anniversary World Tour.

• SS501 “Snow Prince” (2005) — One of the most iconic SS501 music videos, beloved by fans for over 20 years.
• SS501 “Love Like This” — A signature Hallyu-era track that still gets replayed today.
• SS501 “U R Man” (2008) — High-tempo dance track from the SS501 Project Group era.

Live Performances and World Tours

FIVE O ONE came back to the stage in a big way. Their 20th Anniversary World Tour was not just a nostalgia trip — it was a declaration that they’re back and they mean it. From Olympic Hall in Seoul to NHK Hall in Japan to AXA Dreamland in Hong Kong, the tour proved their global fanbase never truly went away.

Tour History and 2026 Schedule

Notable: The Encore Seoul concert on March 7–8, 2026 marked the official close of the world tour and the live debut of the “Set It Off” album. The setlist included beloved SS501 classics: “Love Like This,” “Warning,” “4Chance,” “Because I’m Bad,” “Snow Prince,” “U R Man,” and “Song to Call You” — alongside brand-new FIVE O ONE material.

What to Expect at a FIVE O ONE Concert

If you’re considering catching a FIVE O ONE show, here’s what fans are saying: expect a full-throttle emotional experience. These guys have been performing for 20 years, and every stage move, every vocal run, every fan interaction feels earned. They blend the signature K-pop group precision of their SS501 days with the maturity and stage confidence that only comes from years of solo careers. The encore in Seoul had crowds singing along to 20-year-old tracks with the same energy as if they’d just dropped yesterday.

Keep an eye on their official social media accounts (@fiveoone_offcl on all platforms) for upcoming 2026 announcements — their fanbase is still growing, and more dates could be on the way.