High school student Lee Woo-jin is a promising baseball player whose bright future is threatened when he suddenly loses control of his pitching. His coach loses faith in him, and Woo-jin falls into despair. Everything changes with the arrival of the mysterious student Kwon Tae-hee, who becomes both his mentor and his closest friend.

With Tae-hee's support, Woo-jin overcomes his fears and regains his place as the team's best player. But one day, Tae-hee suddenly disappears. As Woo-jin searches for his friend, he uncovers a shocking truth.