Twenty Years Old.

Two twenty year olds, Kim Hye Rim and Lee Ki Kwang, who attended the same middle school, meet again coincidentally after many years as a college student and an idol group member. Lee Ki Kwang is a member of popular idol group falls in love with Kim Hye Rim, his old friend from same middle school who has never dated before, as the two try to keep their love a secret from the rest of the world.