Dong Soo (Lee Chun Hee) abruptly arrives at Yoon Sung (Ji Jin Hee)'s house raising his voice, "Why are you hurting Da Jin (Goo Hae Sun)? I am warning you to stop this now."
Yoon Sung replies biting his lips, "I can't do that. If I could, I wouldn't have event started with Da Jin in the first place."
Dong Soo grabbing Yoon Sung's neck yells, "How long were you going to hide it? Were you going to tell Da Jin after she realizes can't live without you? Are you a human being? You better keep this a secret from Da Jin forever. And leave."
Dong Soo had found out about Yoon Sung and Da Jin's past. Yoon Sung was the one responsible for Da Jin's mother's death in an airplane crash. After the battle with Dong Soo, Yoon Sung fell helplessly to the floor with a stunned look.