Omok Girl
오목소녀 (original)
LEE Baduk, once called a Baduk(Go) prodigy, quit playing go. At the local Omok(Gomoku) competition, where she played for the prize money, LEE meets with Omok genius KIM An-gyeong and goes to the national tournament. Finally, LEE confronts an inevitable battle with KIM with a terrible secret.
Starring Park Se-wan, An Woo-yeon, Jang Hat-sal, Kim Jung-young, Lee Ji-won, Nam Jin-bok
Watch "Omok Girl" from streaming services Hoopla, Amazon released in 2018. It's a comedy and family movie, and has a rating of 6.2 out of 10 from Imdb which is usually fine for this kind of movie.