Hwijae visits Shoo who also has twins! The 4 twins enjoy a fun time together. Epik High and UV collaborate as YF to make a children's song. How will their song "Straw" turn out? Also Haru gets ride the Tayo bus! Sarang goes on a date with her grandpa. She follows everything he does and acts unbelievably cute! Junu and Junseo do a role play to understand each other's position. Also actress Ku Hyesun brings her dog to help them overcome their fears of dogs. Yukkung goes on an outing with Jungtae and realizes his popularity! And they visit Jungtae's old house.