Sunbae and his GF Dayeon have problems in their relationship due to the issues in sex. The friend Dayton, Bae Naeun, wants to help her by taking her to the club. Dayeon wakes up with the stranger. Meanwhile, Sunbae meets Shimano Miku, the Japanese actress, who will teach him how to have sex in the right way. How will Sunbae and Dayeon overcome this?