Sae and You dated for 3 years, Sae decided to end your relationship because he was soon going to marry a woman of his parents' choice. A few months later, your mother will remarry a man who is younger than her. After Mother's wedding was over she brought her husband to where you live. However, unexpected things happen, you are surprised by your mother's new husband who turns out to be your ex-boyfriend, Sae. At night, you hear a knock on your bedroom door and you open it. And it is Sae.