Lee Know

From October to December 2017, he participated in the survival show Stray Kids, aiming to debut. He was eliminated early on but was brought back for the finale when the group got to perform both with and without the members that had been eliminated during the show. As it was finally decided that the eliminated members would be added back onto the group, Lee Know would later make his debut with Stray Kids.

He officially debuted with Stray Kids and their first mini album I Am Not on March 25. On July 2, 2021, he released the collaborative track "Drive" with Bang Chan through SKZ-Player. It was announced on August 8 that he had become an MC for Show!