When Choi Minjung and her friends decide the easiest option for their involvement in the school carnival is to have a kissing booth, everything seems to be working out fine. That is until Minjung is roped into filling in for one of the kissers. It's embarrassing and slightly humiliating that she has to kiss who knows how many people for the rest of the day -- and things only get worse when Lee Eunsook lines up expecting a nice long smooch.