Watch Pretty Young Sister 4 (2021) Official Trailer

Jeong-woo who is tired of instant food and living alone decides to order delivery food. However, Ga-yeong, the delivery driver, is unfriendly even if she was late. To criticize Ga-yeong sarcastically, he asks, "Will you do everything if I give you money?" Ga-yeong takes the words seriously and attacks Jeong-woo's house. Woo-hyeon is questioning the woman's underwear found at the house of Hyeon-min who came to play at Jeong-woo's house, and learns the situation through Ga-yeong who just came. He said he was better than Jeong-woo. However, Ga-yeong is already full of thoughts of eating both of them.