Tiny Giant {VMIN}

Jimin is not the most popular guy in school in fact hid actually seen as the perfect target. Everyone bullys Jimin and he have enought. He dicided to isolate himself from the world and the first step is to move out. He moved to a new houses and started online school. His new houses is old and he and his brother heard alot of noises but what he didn't saw coming was finding a boy that looks like his 17 but he so small that he could fit on Jimin's fist.

Who's the boy?
Well Jimin succeed at hiding him from the world?
Well this boy be able to fix Jimin low self esteem?
Soul Jimin be able to deal with the responsibility of rasing a kid that's shrink?
What would Jimin do with this boy that ha a giant heart?