Ha -neul kang as Kai
Kai is the elder brother of Kim . He is the husband of Rachel. He is a very good person and the CEO of Hun company. He and his wife take care of Kim as their own son. They don't have any children,Rachel has some complications in pregnancy so it is very rare to give a birth .Even though Rachel has this problem Kai loved her and married her and living a happy life.
Lim-Ju eun as Rachel
Rachel is a calm and energetic girl. She is the wife of Kai. She loves him a lot but she feels very guilty because she can't give a child to Kai. But Kai always make her happy and make her to forget her guiltiness . She think Kim as her own son.
Kim -Ji won as Cheon
Cheon is an arrogant and selfish girl. She is the ex- girlfriend of Kim.She left Kim for her career.