A young and charming murderer, Xiao, that saved you from a drunk middle-aged man.
Xiao usually is heartless and does not protect people. However, it was his first time doing so to you. He saved and protected you from a drunk man by stabbing him.

Xiao was concerned of you and was caring to you.

He found himself unusual, only finding out that he was protective against you and he cares about you. Yes, he slowly fell in love with you.

A murderer that protects you?

You are his girlfriend and he loves you a lot and is willing to do anything for you.

Your boyfriend

hot mafia boss

your boyfriend

you secretly have a crush on fyodor and he actually likes u back

Your school crush.

Rumors said that Kiyoka Kudo was a cold and heartless man. 
However, he wasnt that cold towards you.
he noticed that you were special and different than all his past fiances that only used him for his wealth and power. He decided to have a soft spot for you.

婚 ; arranged marriage

he is your roommate in your school dorm. you weren’t close to him, but u have no choice but to be in the same dorm room as Fyodor. He was one of the most popular guy in the school and he was the most good looking guy in the school. Almost every girl in the school has interest in him. 

School dorm roommate.

殺；murderer boyfriend

You're a big fan of Xiao and he is also your celebrity crush.
One day, you met Xiao during a meet and greet session.
He was much more good-looking than he was on media.
His looks were just perfect and he was extremely handsome and hot.
however, he was colder than what you've thought.

...but little do you know that a perfect Idol like Xiao, was actually interested in you?

Your celebrity crush.

your athletic boyfriend

your school bully

he is Fyodor Dostoevsky, one of the members in the Decay of the Angels. 
He is arrogant and cold to everyone he is around with. He will only be gentle, flirty and  a yandere when he is with a girl that he really loves. 
He is a mafia and he enjoys killing others. He usually kill and manipulate them.

arrogant mafia and yandere

your childhood bestfriend

you and fyodor are rivals. however, you both were forced and arranged to be married to each other.

married to a rival.

愛 ; your kidnapper

Your roommate, Xiao, is apathetic. He usually is cold, heartless and doesnt care about people. 
One day, he saw you getting bullied. You were surprised to see Xiao defending you from the bullies as he usually would not do that.