Around 2012, he left a U.S. university, where he had not adjusted, came back to Korea and enlisted in the KATUSA.
The breakthrough yearThe year he turned 23, he debuted with the single “SRS 2015.” That same year, in the cypher mission on Mnet’s Show Me the Money 4, he handed the mic to Yang Hong-won, then a high school student, and was eliminated. After his elimination he drew more attention, and his name became known. In August, he was DJ for a day on an MBC late-night radio show.
In 2016, he appeared again on Show Me the Money 5, reached the TOP 6 stage, and said in a July interview that malicious comments had grown since the appearance. In December, he parted ways with the crew ADV.
In 2017, he was a mentor on High School Rapper season 1 and led Yang Hong-won to the win. In 2018, he released his first mini album, Costumes.
In 2019, he signed with K Tigers E&C and appeared on King of Mask Singer as Eighth-Grader Syndrome. In 2020, he released the first full-length album Spill. In 2021, he released the single “Southside.”
In 2022, he appeared on Channel A’s Penthouse and said he lost about 80 million won on crypto investments. In 2023, he appeared on Channel A’s Cohabiting, Not Married with a girlfriend of 10 years and won the Money Challenge on Wavve’s Game of Blood 2.
In April 2024, he married, and in December he appeared on Game of Blood 3. In 2025, he planned and released the survival project NO EXIT GAME ROOM with the YouTuber Pani Bottle.
In January 2026, he appeared on KBS2’s The Logic, and in April he appeared on Netflix’s Death Game: Bet 10 Million Won and beat DinDin. In July, he was confirmed for Netflix’s The Devil’s Plan 3 and injured his wrist during a mission on Game of Blood X.
Seo Chul-gu (born Dec 21, 1992) debuted in 2015, the year he turned 23, with the single “SRS 2015,” and became known the same year, after he gave up the mic and was eliminated in a cypher mission on Mnet’s Show Me the Money 4 on Jul 17, 2015. In 2024, the year he turned 32, he married.
Ages are by calendar year (the year minus the birth year), birthdays aside.