Jaechan debuted in 2019 as a member of boy band DKZ, which was named Dongkiz at the time until it changed its name to DKZ in March 2019. He has appeared in numerous web drama series such as “My YouTube Diary” (2019) and "Can You Deliver Time?” (2020). He landed his breakout role in the Watcha romantic comedy series "Semantic Error" (2022). The series centered around a romantic relationship between men, a rare topic in Korean pop culture. Through the role, Jaechan rose to fame and saw DKZ's CD sales increase over 90 times.