He is Jeno. he is your ex-boyfriend, he is handsome, attractive and a gentleman, he also always looks after you. You've been dating for 2 years, but you both decided to break up because your mother and Jeno's father wanted to get married. So, you two are still approaching each other and still trying to get used to it, accepting being step siblings.

his father and your mother don't know yet if the two of you had a relationship before, so the two of you are still keeping it a secret. even after you two broke up, you both argued a bit often but not too seriously just like friends arguing about small things or maybe he's just teasing you a little although not too excessive