Either it happens early in the show or before it. He loved her, but now hates her for something she did to him. Can be romance related or not. She feels bad because of what she's done. Second male lead is coming after her and maybe succeeds, but in the end the male and female lead end up together after he forgives her. 

✔️ Cunning Single Lady 

✔️ 3 Sweethearts and a girl (first and 2nd lead male bot hate differebt girls) 

✔️ Go Back Couple 

  • Emergency couple
  • Discovery of romance
  • Get karl! Oh soojung
  • My sunshine
  • My Lucky star
  • Love Now
  • Hateful but once again