The Reason Why We Can't Sleep

Young Jae is an aspiring webtoon writer. He works part-time at a convenience store during the day. Young Jae has been unable to sleep for 1 year.

Yoo Jung is unemployed. She has been unable to sleep for 2 years. Young Jae and Yoo Jung live in the same neighborhood and they happen to meet. Due to their insomnia, they have similar routines and meet often. They become attracted to each other.