Six years ago, they broke up peacefully; six years later, she returned to him again, stalking him, and she infiltrated into his life step by step, becoming inseparable. But she suddenly disappeared. Jinse has always had an untouchable corner in her heart, but at a class reunion, she accidentally learned something that made her miserable. So she came back, she wanted revenge, but she also fell into trouble, or revenge was just her excuse. Can they go back to the past? Who hurt whom and who let down whom?