On January 5, 2016, he was introduced in SM's pre-debut training team, SMROOKIES. He later appeared in the NCT U's "Without You" music video and also performed live in China at the 16th Music Feng Yun Bang Awards with the sub-unit.
2016–2019: NCT 127, NCT U, NCT 2018 and WayV
On July 7, 2016, he made his official debut in the sub-unit NCT 127 with the mini-album, NCT #127.
On February 18, 2018, he debuted in the sub-unit NCT U with the song "Boss".
On March 14, 2018, he participated in NCT's first full album, NCT 2018 Empathy as part of their NCT 2018 project.
On December 31, 2018, it was revealed that he was a member of NCT's Chinese sub-unit, WayV which debuted on January 17, 2019, with the digital EP, The Vision.