Hwijae and the twins pay a visit to former S.E.S member Shoo, who is the mother of twin girls that are the same age as Seoeon and Seojun. The 2 sets of twins enjoy a fun day together. Epik High and UV continue with their collaboration to produce a children's song and call themselves YF meaning "Young Father". Haru rides the Tayo bus, where Tablo takes her to an antique market. Sarang goes on a date with her grandpa. She follows everything he does. Junu and Junseo do a role play to understand each other's position. Later actress Goo Hye Sun visits the Jang's and brings her dog to help the boys overcome their fears of dogs. Yakkung goes on an outing with Jungtae to the largest street market in Busan where they sample delicious street food. Yakkung also realizes how popular he is with the locals. Later Jungtae brings Yakking to his old neighborhood to see the house he use to live in. Guest stars: DJ Tukutz from Epik High, Yoo Se-yoon & Muzie with daughter Soho from UV, Shoo with twin daughters Lim Ra-hee & Lim Ra-yool, Goo Hye Sun (thetvdb.com)