Any stories where the male lead is cheated on by the female lead. Not necessarily because she's a bad person. She basically made a mistake. She regrets what she did and then she goes through the wringer to get him back after he finds out. Maybe he caught them in the act. They work through it and in the end though, the male lead and female lead get back together.

No Netorare shit. And I know what you are thinking and it's not. Cheating =/= netorare if the person involved still cares about the person they cheated on.