Bangchan and Han is in the mental hospital because they was acting unormal then usual Bangchan and Han used to be clingy, sweet, and affectionate with people they love but now they've been acting... distant, rude and unloving So, they put them both in a child-like room (mental hospital) and they started to act their normal self

They was putting on red bows, polishing his nails with black and red, and he was playing games & the doctor's and nurse's love them because they're cute!