As the birthday approaches, Chan-woo plans a birthday party, and dinner time, Taeran, Hye-kyo, Kim Gan-ho, Inbong, Yeong-ran, and Oh-jung will gather at Chan-woo's house. However, Tae-ran and Hye-kyo have been arguing over a minor issue, and Kim Gan-ho and In-bong are fighting emotionally as a starting point for Chanwoo's birthday present. In addition, when Oh Jung's jealousy and frustration at the endless expression of affection, the birthday party quickly becomes a mess, and even worse, the children fight against each other. Chan-woo was left alone during the fight. Unable to rectify the situation, he goes to the porch alone. Young-gyu, who is calmly burdened with Chan-woo's birthday, sees a shocking graffiti at the school's bathroom. 'Young-gyu stupid' Young-gyu is depressed and falls into a sense of suspicion. Mi-sun barely approves Yeong-gyu, but becomes depressed again when she sees new graffiti. (Source: SBS)