S1E2: One Family Name

After growing up together as a family, Ju-won, San-ha, and Hae-joon go to high school together. San-ha and Hae-joon are hot with the girls, causing Ju-won to deal with the onslaught of requests from the girls to deliver their love message to them. Meanwhile, Ju-won longs to live under one family name through adoption, which the others think is absurd. Later, Hae-joon catches a suspicious man taking photos of him.