Jo Shinu, Oppa's friend, whose face was exactly her type, was a third-generation chaebol with good looks and capability. Yet, he was a dangerous man who ruined women's lives with his nasty temper, two broken engagements, and endless scandals. He was, literally, a bastard.

At the wedding of her long-time crush, Yuju ran into Jo Shinu, soaked from the uncooperative weather. As usual, he led her to the guest room with an unfriendly attitude. After a few sips of wine to kill time, Yuju, hazy from the alcohol, looked at Jo Shinu and realized he truly had a face that could charm anyone.

"Oppa, sleep with me."

The next morning, she woke up in bed with him... Wait, I'm in bed with Oppa's friend?!

"Lee Yuju, I'm terribly curious."

"The reason you slept with me and ran away."

A one-night stand with Oppa's old friend... a bad man who ruins women's lives. I slept with him and ran away?!