What's wrong with cheating?

What's wrong with cheating??? Kim Yeo-ju, the master of cheating Jeon Jung-kook loves Yeo-ju so much "I'm going to cheat on you, what's your business, you piece of shit?" : "Can you look after me now?" Then Jung-kook's love fades, and Yeo-ju tries to look at him. This tangled love story!! What will happen?