Changbin

Biography

Seo Chang-bin (Korean: 서창빈; born August 11, 1999), known mononymously as Changbin, is a South Korean rapper, singer, songwriter, and record producer. He is a member of the South Korean boy group Stray Kids, formed by JYP Entertainment in 2017. He is also a member of 3Racha, an in-house production team and sub-unit of Stray Kids.
Besides his contributions to Stray Kids, Changbin participated as a contestant in Show Me the Money 9 and has collaborated with various artists, including Yoon Ji-sung, Thai rappers F.Hero and Milli. Changbin became a full member of the Korea Music Copyright Association in February 2023.

Early life and education

Seo Chang-bin was born on August 11, 1999, in Yongin, South Korea. He graduated from Bora High School and studied at Gukje Cyber University in the Department of Entertainment.

Pre-debut: 3Racha and Stray Kids reality

Changbin joined JYP Entertainment through an audition where he danced to a self-produced song. During his trainee period, Changbin teamed up with fellow JYP trainees Bang Chan and Han to form the underground rap group 3Racha, releasing multiple mixtapes under the pseudonym SpearB, without the company's knowledge. They uploaded their first mixtape, J:/2017/mixtape, consisting of seven tracks, to SoundCloud.
In 2017, Changbin participated in JYP's survival show Stray Kids and was confirmed to debut with eight other contestants. Throughout the show, he demonstrated his rapping and music composition skills, with several of his written songs included in the pre-debut EP Mixtape.

2018-present: Stray Kids and collaborations

Changbin officially debuted with Stray Kids through a debut showcase and the EP I Am Not on March 25, 2018. He participated in the composing and writing for the songs in the EP.
In February 2019, Changbin featured on "You... Like the Wind", a side track from Yoon Ji-sung's debut album. In 2020, Changbin participated as a contestant in Show Me the Money 9. He passed the 1st Round but eliminated in the 60 Seconds Team Trial. He went viral for his Jutdae (Korean: 줏대; lit. 'principles; strong spine; backbone') meme, which featured in an advertisement of Samsung Galaxy three years later.
On October 28, 2021, Changbin featured on the song "Mirror Mirror×Mirror Mirror28 October 2021 · SingleSpotifyYouTube Music (search)Tracklist · 1 track1Mirror Mirror3:52" by Thai rappers F.Hero and Milli. The song won Best Collaboration awards from Thailand's Toty Music Awards and The Guitar Mag Awards.
In February 2023, Changbin, along with his fellow 3Racha members Bang Chan and Han, was promoted to regular membership in KOMCA and, as of August 2026, has credits for 207 songs, the sixth most among K-pop idols.
On October 15, 2024, Changbin was featured on the song "VAY" from Itzy's ninth EP Gold, for which he also wrote the lyrics and composed the music. In September 2025, he featured on "R&B Me" by Jun. K from the EP Dear My Muse.

Fashion

In May 2024, he made his Met Gala debut with Stray Kids as the guest of Tommy Hilfiger. On February 26, 2026, footwear brand Autry announced Changbin as its inaugural brand ambassador.

Philanthropy

On February 16, 2023, Changbin donated ₩100 million (equivalent to ₩100 million or US$78,000 in 2025) through the international relief organization The Promise to aid the relief efforts following the earthquake in Turkey and Syria. His contributions led to his appointment as a member of the Honors Club on March 30.
Changbin donated another ₩100 million (equivalent to ₩100 million or US$78,000 in 2025) to Samsung Medical Center on August 11, 2025 to celebrate his 26th birthday. The donation he made will be used to cover the treatment costs of children and adolescent patients receiving treatment at Samsung Medical Center, as well as emotional support activities to help them achieve psychological stability.
On August 11, 2026, Changbin donated ₩100 million again to Samsung Medical Center in celebration of his 27th birthday, with the donation allocated to treatment costs for pediatric and adolescent patients and emotional support programs for their families.

Endorsements

On September 1, 2023, Changbin released a single titled "Fly High" for the promotion of Samsung Galaxy Z Flip 5. On February 5, 2024, he featured in the release of another promotional single, Kim Chang-wan's "8th Grader (Respect Your Dreams)", for Samsung Galaxy S24.