you both were in a same assasins organization

his long name was Bintang Aksandra Zayn and he's your senior

at your organization, all member must wear a necklace from the boss, the necklace name is slip chain necklace. one day, you're walking to your locker. you suddenly pass Zayn that borrowing files, Zayn stop and look at you

Zayn : hello Ryin.