A relentless marketing executive and a warm-hearted intern are always at odds with each other but everything takes a wild turn when their souls switch after an unexpected kiss.

Days after a heart-fluttering encounter with a charming man, Yu Na Bi bumps into him again. This time, she's formally introduced to Park Jae Eon.

Baek Ho-rang is a high school student. Due to her pretty appearance, she is popular on social media and at her school. Yet, Baek Ho-rang only has one friend, due to her condescending personality. Baek Ho-rang encounters a problem. She learns that someone is trying to unveil her secret. To find that anonymous person, Baek Ho-rang joins her high school's broadcasting club. Go Eun-taek is the chief of the broadcasting club. He is a perfectionist and respected by the club members.

After a series of unfortunate events, Mok Hae-won quits her job in Seoul and goes back to Bookhyun Village, in Gangwon Province, where she briefly lived when she was in high school. There, she meets again her former classmate and neighbor, Im Eun-seob. He also came back to Bookhyun after leaving the village for a few years and now owns a bookstore.

All I ask for is to be in a relationship for once in my life. I am about to throw a gamble of a question with 18 years of my life on the line. A youthful comic drama about attempted relationships with reasons for failure.