I don't know who am I anymore [Idolish7 AU]

"Okay ossan, I will leave you alone then."

"Oi! Don't call me ossan!! I'm pretty sure that I only a few years older than you!" He will assume the brat is still a high school student, meaning the gap of his age and the brat not really far.

The brat glance at him with a shrug. "Still an ossan for me."

Ok that's it. This brat really need some knock on his head. "You brat-!"

Or Gaku just want to take some fresh air outside but meet with an annoying brat.

WARNING!! Major character death. Mention suicide, self-harm, suicidal thoughts, bullying. Also, Dissociative Identity Disorder inaccurate like really cuz I'm just a student who took English course not psychology. So please don't attack me. Tenn really REALLY OOC btw.