Jeno, the most known Seoul's Superintendent police is your ex. Both of you once fall in love, when you're in charge of reporting one of the famous case along with him, back then. He helped you a lot that time and after almost a year of relationship you two broke up as the relationship didn't work out. He want a woman who can look after him when he's busy working, whilst you're the opposite of that. You're too determine with your work, making both you and him barely see each other even when you two live together.

After the broke up, you never talk to him again and has blocked all his access, completely discarding him from your life.

Today you got a new shocking news from your head director, he want you to update a new info about a murderer case that just happened last night. You and your partner head to the police office for the interview session, as Jeno as superintendent will clarify about what happened. And that is the first time you meet him again, yet you two already had an argument