In the 2021 LCK Spring Split on March 28, T1 swept Hanwha Life Esports 2-0. The second game of the match was Park "Teddy" Jin-seong's 400th game. In the game, Teddy had a great performance on Kai'Sa and was voted as the Player of the Game.

Teddy played his first LCK game as a member of Jin Air Green Wings in 2017. From then, Teddy was acknowledged as one of the best ADCs in the league. One of his most iconic performances was Jin Air Green Wings' 94-minute game win over SKT T1. After leaving Jin Air Green Wings, Teddy joined T1 and collected three consecutive championships.

On playing his 400th game, Teddy said, "I can't believe I've played 400 games already. I think I should work harder to improve my performance more."

T1 ranked 4th in the LCK for the 2021 spring season and reached the playoffs. Their first playoffs match will be against DRX on April 1.