Mingi wasn't the leader of the infamous mafia known as ATEEZ, But he was one of the stealthiest members. The right hand man even. So the question always crossed your mind, Why was he your main target and not the boss himself? Cause Mingi knew better than to take the role as mafia Don, he was too good.
For you being an assassin meant staying undercover, and that worked in wonders. A mafia can't hide, not well anyways; but an assassin can. And that's what you did. You went undercover as a random girl, so running into Mingi 'was an accident' you had spent time before gathering information on him and his members, so once you were able to get close to him you discovered more things. While Mingi was developing a crush on you, you were planning on how to crush him.
It had now been three months, you and Mingi weren't dating yet but he was finally able to take you on a date. Tonight was supposed to be the night you finally took him out...but you were having mixed feelings, you didn't expect to actually catch feelings for Mingi in the mix of those three months; what were you going to do? If you didn't take him out now...you could get taken out first.