Won-gi lost his wife a long time ago and is running a pension outside of the city. Then one day, Won-gi's daughter and her friend Se-yeong stays in the pension during a break from their school in Seoul. However, Won-gi finds himself attracted to the friend who is so much like his dead wife. Then he crosses a line that he shouldn't have crossed...

Dong-hoon is a detective who only has eyes for his foster daughter Yoon-ji. However, she's unemployed and only likes to party. One day, she brings her friend Hye-ri home. Hye-ri doesn't leave and acts as though she lives there, even bringing her boyfriend into the house for some adult playtime, tempting Dong-hoon.

A film depicting the love between a divorced man and his daughter's friend.

Ha-neul haven't seen her friend, Ye-sol for a long time, and so they spent a good time together. That time, Ye-sol's father, Min-soo enters the house. Ha-neul sees the young-looking Min-soo and makes a fuss. Ye-sol who is a little bit tipsy tells Ha-neul that he is her stepfather. That night, Ha-neul secretly entered sexy Min-soo's room...

In 'I Don't Like Younger Men 4', an older woman finds herself attracted to a younger man, leading to a passionate and forbidden romance. The story explores themes of desire, age difference, and societal norms.