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For other people known as 'Si Woo', see Siwoo.

Si Woo (시우) is a South Korean rapper and lyricist under Wolfburn. He is a member of the boy group BXB and a former member of the boy group TRCNG.


2017–2022: TRCNG[]

On October 10, 2017, Si Woo debuted as a member of TRCNG with the release of their mini album New Generation.

On March 27, 2022, Si Woo revealed that his contract with TS Entertainment had ended on February 28, thus also confirming his departure from the group.

2022–present: BXB[]

On April 11, 2022, it was revealed that he had signed with Wolfburn, along with fellow former TRCNG members Ji Hun, Hyun Woo, and Kang Min.

They made their debut on January 30, 2023 with the digital single "Intro: Flight and a New Beginning".

Writing credits[]

Artist Song Album Type
BXB "11:59" "Boyhood I S#1" Writing
BXB "Fly Away" "Intro: Flight and a New Beginning" Writing
"Planet" "Chapter 1. Our Youth"
"Planet (Twin Ver.)" "Chapter 1. Our Youth (Twin Ver.)"


  • He is an excellent sportsman: he knows how to play volleyball (he came in second place) and has a black belt in Hapkido, where he participated in competitions (he even won the silver medal in one of these competitions).[1]
  • He lived in Kyrgyzstan for 7 years.[2]
  • He can speak Russian.[2]
  • His MBTI personality type is INFP.[3]


Main article: Si Woo (BXB)/Gallery