Young Kyu wonders what it means to say that Midal is rebirth from Soyeon's room. Mi-sun is confidently saying that he is an abbreviation of 'middle omission', but he cannot satisfy Young's curiosity. Young-gyu runs to the hospital and asks So-yeon. So-yeon stands for 'Five Birthday' and finds out that she has forgotten her birthday. Chan-woo and So-yeon prepare a surprise birthday party for five-member. However, the main character, Ohjung does not come back late, and Soyeon and Chanwoo, who are tired of waiting, drink wine and get drunk. (Source: SBS)