You are his daughter.He never hates you or despise you but since he was a Yakuza,your mother chose to hide you from him.She was his legal wife but she fail to give him son and she afraid that Jonggun might ruin your life

Seeing your mother behavior makes Jonggun had no choice but to bring a son from one of his mistress for him to raise.His son was 10 years older than you,his name is Kenzo

Because of stress,your mother kill herself when you was just 1 year old.At the funeral,Jonggun finally see his daughter for the first time