Do Do Hye is a math teacher. She has a personality that is too honest at times and this causes her to face embarrassing moments. Whenever she has one of those embarrassing moments, she writes down in her wrong answer notes and reflects on herself.Do Do Hye goes to a camp for writing college entrance exam questions. There, she meets two men with whom she had embarrassing moments with in the past.

Eun Jae has studied to become a police officer for the past 5 years, but she has a hard time due to failing her exam. Joon Ki has been studying to become a public servant for the past 8 years. He is proud of his younger brother Yoon Ki who works as a reporter. One day, Eun Jae hears a woman screaming

Kang Hyun Ho has never had a boyfriend in her life. She begins swimming lessons at a sports center. There, she develops a crush on Jo Woo Jin. Meanwhile, Han Yoo Ra is Kang Hyun Ho's swimming instructor. He develops feelings for her