Donggook and the three kids collect the items they do not use and head to the junkyard. After they are back at home and Donggook goes out, the kids cause an unexpected trouble. Sam hears a shocking news about William's teeth growth when William and Bentley get different checkups at the clinic. Meanwhile, for Seungjae, who likes dinosaurs, Jiyong takes him to a special group meeting. Guest stars: Jo Se-ho (via video call), Boom (via video call) (Source: Wikipedia)