@DeanWinchester - Uh, buddy, she basically already did. That's why there was a big fight with her, the tiger loli and MC. She told him that if he loved her, he could only be with her since she doesn't believe in polygamy and "sharing".
I agree with the stop hitting bit tho, it's something that Asian rom-coms troupes never fail to include.
@Kwijo Yep, the growing up thing. Because of the old adage that drinking milk helps you grow taller (Edward Elric vehemently disagrees with this, of course lol)
Narae's violence is out of control. I don't know why the author insists on having the MC get constantly physically abused, or why his character takes it as a matter of course.