[3][4] He is the younger brother of Lee "INnoVation" Shin-hyung [ko], a South Korean former professional StarCraft II player.

[9] On December 18, 2018, Lee played in KeSPA Cup 2018 under the amateur team, KeG Seoul.

[10][11] In December, it was announced that Lee joined SK Telecom T1 under the name "Catan".

[18] On January 13, 2021, Lee played his first game of the season in LCK Spring 2021.

[20] Lee was included in the roster for the 2021 League of Legends World Championship,[21] in which he and his teammates ended the journey in the semifinals.

T1 finishing second in LCK Summer Finals in another rematch against GenG, with the most championship points in the LCK, the team qualified for the 2023 World Championship, marking Lee's third Worlds appearance.

After defeating tournament favorites JD Gaming 3-1 in the semifinals, Lee and T1 defeated Weibo Gaming in the finals 3-0, marking Lee's first World Championship and T1's fourth.