All the families are gathered in Jeju-do and they have a blast at the twin's 1st birthday party. The next day, each family goes on their own adventure. Haru's family go horse riding and eat a unique type of seafood instant noodles. The Jang brothers go hang gliding and swimming. Sarang's family go to pick dekopon and go in search of a dol hareubang. The twins enjoy a date at the soccer stadium and later visits one of their dads friends, where Seoeon shows his Casanova personality when he chases Hwijae's friend, 7 year old daughter around her house.