Si Woo

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. 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".