that's because she is an illegitimate child of her father. her father fell in love with a 'commoner' which resulted in him being hated by the family. they threatens to revoke his inheritance if he continued the relationship. well, jeon youngmuk himself was a voracious person. he preferred money over love. so just like that, he left her lover and married the woman chosen by his family. as a surprise, the woman was barren while at the same time his ex informed him about their child. it was scary for him to imagine the company would fall to his cousins if he has no children. thus he paid someone to kill his ex and took his daughter to live with him. the rest of his family was forced to accept that decision though it wouldn't change their attitude toward the child, moreover soyeon's stepmother. she hated soyeon very much to the point she barely talk to her. soyeon knew the fact when she was 16. ironic because she couldn't even cry at the fact knowing it would be useless tears. now she decided to just live her life as her father told her to. well, at least she would inherit the company.