Ha Yoon-seo has worked hard her whole life: after raising her younger brother alone, she is now a marketing manager at a credit card company. Her life takes a dramatic turn when she discovers that her boyfriend, Seo Ju-won, is the heir to the family that owns the company! Upon learning of their relationship, Ju-won's mother offers Yoon-seo money to break up with him, and Yoon-seo accepts. However, Ju-won is determined to win her back and will stop at nothing to reclaim her heart. Can Yoon-seo and Ju-won overcome obstacles and find their fairytale ending, or will reality tear them apart?

Su-jin, who works as a karaoke helper at an entertainment district in Seoul and a press office salon, asks Ji-yeon, a college student who lives with her, to work for her for one day when her father suddenly asks her to meet her. Su-jin meets Ji-yeon's boyfriend, Seung-yeong, in liberal arts class at her school, where Ji-yeon took her place, and falls for her.

"A young man in his 20s loves and has a strong sexual desire for Seon Hee. She is a fresh college girl who always dreams of a romantic kiss with her first love. She has participated in various community service activities for her father, a third-term city councilor. There was one volunteer activity that she went only for herself. The nursery where her first love Jin Soo is. Jin Soo is the son of the head of the nursery school. Seon Hee runs to see Jin Soo who is always gentle and warm. There's a sweet suggestion for Seon Hee. To have her first kiss with Jin Soo. Will Seon Hee be able to defeat her rival and succeed in a sweet kiss with Jin Soo? ""I asked you to go"" Another young man, Joon-seok, is worried about the same but for different reasons. Seon Hee, I love you... His first accidental kiss with Seon Hee but it's just an accident. He is worried about Seon Hee, who considers him only as a younger brother and a junior. Joon Seok, a pure young man who has to be seen while doing the same volunteer work... Will his first love with Seon Hee ever come true?"