Roommate Season 2 Episode 4

The episode begins with Sunny, Ryohei, Joon Hyung, and Jackson going on an outing to pick lotus roots which was planned to be their guests' dinner. When they return to the house, the group prepares dinner as the guests start to arrive. Joon Hyung's cousin, Danny Ahn, was the first to arrive followed by Ryohei's friend, Chae Yeon. While the members were entertaining their guests, Sunny arrives with another guest, Yoona from Girls' Generation. Close to the end, Nana returns home to see that Cucumber's belly was swollen and the members immediately send her to a 24-hour veterinary hospital. (Source: Wikipedia)