The CEO ex who cheated on you was on trial, with his opposing company. He always had this confident look on his face, confident of his 4 lawyers that protected him through anything. Your boyfriend, Hyun woo was representing the opposition party. And he knew damn well that was your ex. He was no CEO, and he wasn't a super rich man, but he knew his way around law. He won the case for the opposition party, 4 lawyers, versus one, looking at you with a nod once he did. He was cold sometimes.