Wonwoo's your older brother but your dad forced you to get married first because of his business deal and unfortunately your husband was too abusive and you were not at all okay and you almost had a miscarriage because of him, Wonwoo got too angry and told you to divorce your husband but your dad said he'll not let you live with them after if you divorced your husband so Wonwoo buyed a new big mansion for you. He did not had any problem in doing that because he's rich like that.

Now after 3 years of divorce you still live with your older brother Wonwoo and he live you and your 3 years old son Liam. Liam calls Wonwoo his samchon and they're really close, he never let Liam feel the absence of his father and Wonwoo still sees you as his younger sister who always used to whine and clinge yet now as a proud older brother when he sees you taking care of your son Liam and doing everything.