Tae-gyu and Si-ha take the subway to visit a flea market. Chaos ensues in the Lee household as the 5 siblings plan a birthday surprise for Dong-gook. William and Bentley hand out popcorn around the KBS studio and Sam films a show. There's love in the air as Seung-jae attends a birthday party for Alice. Sung-min finishes his 48 hour challenge with the kids.