Cinderella at 2 AM S01E01 - Goodbye, Seo Ju-won

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.