Yeong-bin succeeded in getting a job. He is excited and buys food for his friends. Na-yeong is going to give a congratulatory gift to Yeong-bin for getting a job. Meanwhile, Ji-hee and Yeong-bin meets separately, leaving Na-yeong and Min-soo behind. Na-yeong, who was on a date, calls Ji-hee and Yeong-bin and everyone gathers again to congratulate Min-soo. The fun continues, and while drinking together, they start to open their eyes to each other's love... The love between two men and women, no one knows, is just beginning.
Na-yeong is studying to be able to find a job. Studying alone is not easy but she still spends time alone. When she found out that her friend Ji-hee's grades have improved a lot while studying, she seduced her friend Yeong-bin and took off her clothes, asking him to join her. But Ji-hee's studying was different than I thought. A study forced to have sex. Na-yeong meets Min-soo in a new study and quickly starts to adapt to a new study. Will their unique classes end well? The delicious and bitter story of two different men and women just begins.
Jin-woo lives in his friend's house and he likes his friend's sister. Although he has a girlfriend, he's constantly looking for a chance to approach the sister. However, he doesn't get the nerve to do so until he approaches her with the excuse that wearing a woman's panties on an important day brings luck.
