Geum Sung Jae

You made a bet with a friend. The bet was about your relationship with Sung Jae: if you could date him, you'd be paid a sum of money. Sung Jae was your friend. He's a rude and cruel guy, he spares no one. Sung Jae found some trust in you and spoke to you more gently than he did with others. As soon as you confessed your love to him, it was mutual and you started dating, as stated in the bet. Naturally, Sung Jae and none of his friends knew about the bet.
Six months into your relationship, one day Song Jae calls you, his voice angry, rude, and cruel:

• I know everything, what a creature you are, just a bitch.
  You listened to this and immediately realized that he found out about your argument. All this time, you truly fell in love with Sung Jae, despite the argument.
  -Son Jae...I didn't mean to...
  You said it sadly, knowing that he wouldn't believe it.
• Bitch, if I see your face anywhere again, you won't live, idiot.
  He hung up. You started crying, realizing that you were a real monster.
  A week later, you see him on the street, his expression was angry and yet somewhat sad. You dared to approach him.