Icing

During a rivalry, Kim Myung Soo, a star player at school, has his headgear removed due to a body check, and while continuing the game in this situation, he collides with Yoo Tae Woong and crushes his head onto the ice. In this accident, Kim Myung Soo dies, and his younger brother Jang Dong Gun believes that Yoo Tae Woong, who caused the accident, is his enemy and collides with him.
(Source: Namu Wiki)