Rin's your ex-fiancé, his mother threatened you 5 years ago and told you to end your relationship with him. He had no clue and ended up focusing his career towards success.

Sure he was heartbroken, but you felt it too. The both of you were never able to move on.

Yet he did it, and now he's a multibillionaire. Faith crosses, and you both met again. He invested in your company and chose you for no reason.