1CHU

1CHU (원츄) is a South Korean pop act under Moai Entertainment, originally formed as the first sub-unit of the girl group HeyGirls. The duo – Chaerin and Sulhee – debuted on July 12, 2022 with the bright, summery digital single “Oasis,” which introduced the pair’s future-bass sound and beach-ready visuals to K-pop fans looking for something outside the usual big-label formula.

After HeyGirls officially disbanded on December 26, 2023, 1CHU stepped out from under its parent group’s shadow and became a fully independent act. The duo kept up a steady stream of digital singles, including “Siren” (2023), “Punk Hot” (2024), “It Was You” (2024), and “Sagwija (Date With Me)” (2024), building a small but devoted fandom known as Chuing. Both members also branched out into the Korean-Japanese project group Puzzle, showcasing their versatility beyond the 1CHU name.

In February 2025, Sulhee’s contract with Moai Entertainment expired, and she departed the agency along with her spot in 1CHU, Puzzle, and the then-upcoming group IWU. That left Chaerin as the sole remaining member, transforming 1CHU from a duo into a solo project while keeping the group’s name and identity intact. Despite the lineup change, 1CHU’s discography remains a snapshot of a group unafraid to experiment with sound, from breezy summer pop to punk-tinged rock influences, carving out a distinct niche among nugu (under-the-radar) K-pop acts.