Han Ji‑sung (born September 14, 2000, Incheon, Republic of Korea) is a South Korean rapper, singer, and songwriter who rose to prominence as a member of JYP Entertainment’s boy group Stray Kids and its production unit 3RACHA. After returning to South Korea at fourteen, Han auditioned for JYP and became a trainee, later co‑founding 3RACHA with Bang Chan and Changbin; the unit produced the group’s early mixtapes and later "Carpe Diem" in 2020. Han made his official debut with Stray Kids on March 25, 2018, with the EP I Am Not, and has since contributed to every Stray Kids release, writing and producing tracks such as "Maniac" and "Venom" on the 2021 album Oddinary. In addition to group work, Han has written for international artists-including NiziU’s "Paradise"-and composed soundtrack pieces like "Updraft" for Typhoon Family (2025) and "Let It Show" for Yumi’s Cells (2026). His achievements include becoming the youngest K‑pop idol to join the Korea Music Copyright Association in February 2023, earning a Best Hip‑Hop Video award for "Just Breathe" with SKY‑HI in 2022, and receiving the Prime Minister’s Commendation with Stray Kids in 2023. The track "Let It Show" for the teleseries Yumi's Cells 3 was released in April 2026 and entered Melon's Top 500 Melon domestic chart at rank 24 the next day.