Real life drama but not believable

The main couple lacked any kind of chemistry. During the last couple episodes I was rooting for them not to get back together. I just did not see what the ML saw in the FL...she was mean and selfish..to her boyfriend and her mom. She was also clearly out of the ML's league in every way and yet he was so head of heels for her. ML was so unrealistic as well. I get that most males in Kdramas are perfect romantic gentlemen but this dude was too much. I'm surprised I didn't drop it so that's a positive.