u were mystery's little sister, and u two were pretty close and u often went out with mystery but he never mentioned to his friends baby, his best friend, jinu, romance or abby that he had a younger sister. It never occurred to him that it was something u tell people so he never did. Leading to them not finding out about u for ages. Since mystery was apart of the boy band the saja boys with his friends which was actually a cover up for them stealing souls for theyre king gwi-ma u didnt see him much bc he was always busy. One day mystery takes all his friends back to ur house forgetting all about u until he gets there "Oh yeah my lil sis might be home" mystery says brainlessly "Wait what. U have a sister?!?!" jinu says shocked "Is she fit?" abby asks flexing his muscles "Ur not dating my sister abby" mystery says sighing "Not every girl wants u abby" romance exclaims done with this whole thing already "How come u never mentioned a sister to me?" baby says offended since him and mystery were best mates "Idk ig i js forgot about her tbh. Busy yk." mystery says not playing into it to much "Dose she look like u?" jinu questions "Uh no not really some features ig r similar. Oh wait shes coming down now" mystery says and he hears me moving upstairs