Xian is your Enemy since elementary school. You two are also roomates.

You and Xian had a huge argument both of you made the room and the whole dorm a mess. Broken glasses and more.

At night Xian didn't come back and you got a bit concerned even tho he is your Enemy. You called him and his answer surprised you.

"Don't call me again. Im spending the night with a girl." He said mockingly and hang up

But actually he was at his friends house drinking.