Changbin

For the Taiwanese township, see Changbin, Taitung. In this Korean name, the family name is Seo. Changbin Changbin in January 2026 Born Seo Chang-bin August 11, 1999 (age 26) Yongin, Gyeonggi Province, South Korea Other name SpearB[a] Occupations Rapper, singer, song writer, record producer, composer Years active 2017–present Works Songs written Musical career Genres K-pophip hopelectronica Instrument Vocals Label JYP Member of Stray Kids3Racha Korean name Hangul 서창빈 RR Seo Changbin MR Sŏ Ch'angbin Signature

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.[1]

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 [ko] and studied at Gukje Cyber University in the Department of Entertainment.[2][3]

Career Pre-debut: 3Racha and Stray Kids reality Main article: Stray Kids Changbin joined JYP Entertainment through an audition where he danced to a self-produced song.[4] 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.[5] They uploaded their first mixtape, J:/2017/mixtape, consisting of seven tracks, to SoundCloud.[6]

In 2017, Changbin participated in JYP's survival show Stray Kids and was confirmed to debut with eight other contestants.[7] Throughout the show, he demonstrated his rapping and music composition skills, with several of his written songs included in the pre-debut EP Mixtape.[8]

2018-present: Stray Kids and collaborations Main article: Stray Kids Changbin officially debuted with Stray Kids through a debut showcase and the EP I Am Not on March 25, 2018.[9] He participated in the composing and writing for the songs in the EP.[10]

In February 2019, Changbin featured on "You... Like the Wind", a side track from Yoon Ji-sung's debut album.[11] In 2020, Changbin participated as a contestant in Show Me the Money 9.[12] He passed the 1st Round but eliminated in the 60 Seconds Team Trial.[13] He went viral for his Jutdae (Korean: 줏대; lit. 'principles; strong spine; backbone') meme,[14] which featured in an advertisement of Samsung Galaxy three years later.[15]

On October 28, 2021, Changbin featured on the song "Mirror Mirror" by Thai rappers F.Hero and Milli.[16] The song won Best Collaboration awards from Thailand's Toty Music Awards and The Guitar Mag Awards.[17][18]

In February 2023, Changbin, along with his fellow 3Racha members Bang Chan and Han, was promoted to regular membership in KOMCA and, as of April 2025, has credits for 181 songs.[19][20]

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.[21] In September 2025, he featured on "R&B Me" by Jun. K from the EP Dear My Muse.[22]