Dear X - Choi Jung-Ho killed Seon-Gyu for protecting Baek Ah-Jin! (Episode 3) [ENG SUB}

When Jung-Ho (Kim Ji-Hoon) arrived at Ah-Jin's (Kim You-Jung) house, he found Seon-Gyu (Bae Soo-Bin) already hurting him, Jung-Ho intervened, leading to a physical altercation wherein Seon-Gyu nearly fatally wounded him. Following this, Jung-Ho struck Seon-Gyu with a baseball bat, resulting in his immediate death.