1x13 - The Return of Superman

Sarang visits Junu and Junseo, and Haru visits Seojun and Seoeon. Hwijae and his wife Jeongwon tries to play a candid camera trick on Tablo, but their prank backfires and Jeongwon ends up suffering. The Jang brothers vies for Sarang's attention because of her cuteness. Sarang's seems to prefer the older and more mature Junu as a playmate. Haru is excited about spending a night at the twins home and can't wait to play with them, but she ends up making Hwijae and her dad suffer through the entire night. It's the Seollal special where all the families gather for the first time.