This is just another form of harassment, my main problem with red flag to green stories is that the protagonist deserves someone better and shouldn't be with the bad person, and yes he will probably change and get better, even if he gets better he doesn't deserve it Kim Dan mainly because of everything he did, many writers don't know how to deal with this type of character
(and joo crossed the line of being a jerk), but I'll try to be positive and hope for the best.
(and joo crossed the line of being a jerk), but I'll try to be positive and hope for the best.

Roses are red, violets are blue... you're so ugly even hello kitty says goodbye to u ♥ !!. 
