Ji-won is an erotic writer, but she has not had sex yet, so she cannot write realistically. Eun-sik and Seong-gook compete for their first sex under the pretext that Ji-won is a virgin for her work, and Seong-gook's plan goes up in smoke when his wife Hyeon-hee returns home. On the other hand, Hyeon-hee is curious about Eun-sik and approaches him because his previous job is adult learning and mastering. In this situation, will Ji-won be able to finish her first sex safely and write a huge master...