William and Sam visit a friend who also has an infant son named Noah. Seoeon and Seojun are visited by their favorite friends including a pair of raccoons. Two months ago, they had met the raccoons when they were small, but now they have grown so big that the twins call them boars. Soeul and Daeul go to the zoo at an amusement park where Bumsoo rides the roller coaster by himself. (Source: Wikipedia)