After dating Ju-won for a year and a half without knowing he was the youngest son of the AL Group family, Yun-seo decides to break up with him at his mother's request while accepting her money. As promised, she attempts to break up with him by making him gradually resent her. However, she gets drunk and unknowingly calls him to break up.

Ju-won and Yoon-seo wake up both in despair after realising what they did and said to each other last night, intoxicated. They try to avoid one another at the company but end up face-to-face awkwardly. Meanwhile, Ju-won's mother reminds Yoon-seo of the promise she had made her, and Yoon-seo's brother gets into trouble at school for school bullying.