Yunjeong and Kyungwan bring Kkom-kkomyi to his first check up. Ilgook take the triplets to the park where he tires himself by chasing after each triplet. Afterwards he gives each of them a bath. Sunghoon takes Sarang to meet one of his childhood heroes. Later Sunghoon's friend Jang Keun-suk pays a visit to the Choo home, where Sarang ignores him but her mom Shiho shows her fangirl side. Haru and Tablo visit Hyejung at her film set. Haru shows her jealous side when one of the child actors seems to be close to her mother. Hwijae takes the twins to a puppy pet shop where the boys have fun playing with the puppies. Later Hwijae and his wife take the twins to Namsan Seoul Tower to celebrate the twins 500th day and leave a loving message on a lock. Yunjeong, Kyungwan and Kkom-kkomyi say their goodbyes as this is their last episode.