The Supreme Player is a Korean professional tournament, a round robin league which selects a challenger to face the reigning champion in a best-of-five match.
See the Go to Everyone! section for more information. There is also a female equivalent, the Supreme Female Player (or, as GTE calls it, the "Supreme Player of Female").
In the first edition, in 2020, there was of course no incumbent. Shin Jinseo did the best in the eight player league (6-1), losing only to Park Junghwan. Park did the second best (5-2), and the two progressed to the match. Shin beat Park 3-0.
In the second (2021) edition, Shin, being the champion, did not have to play in the league, which had expanded to nine players. This time Park displayed an incredible performance, beating all eight of his opponents. His good form showed in the match, too, where he did better than in 2020; however, Shin was still able to defend his title successfully with a score of 3-2.
Shin Minjun was victorious in the league of the third edition (2022), scoring 7-1. He is currently down 0-2 to Jinseo, meaning that he'll lose the match if he loses another game, and that he must win the next three in order to take the title. An unlikely prospect.