A group of 20-somethings who are inextricably bound together having shared the same third-grade class. Now face to face at an impromptu reunion to celebrate the 20th anniversary of the day they met, they wonder if they'll have anything in common besides vague memories of playground kisses and underwear sightings on the monkey bars. Turns out they do. After two decades apart for most of them, some are eager to show off, some want to rekindle old crushes and others just want to satisfy their curiosity.
고교 시절 함께 놀러 왔던 산장을 오랜만에 다시 찾은 친구들. 끔찍한 사건에 휘말리면서 해묵은 비밀이 서서히 드러난다.
High school doesn't really end after graduation. Whether you like it or not, it follows you around wherever you go. It may be in the back of your head, but it's there. Sometimes it comes out when you're around your old classmates, and you revert back to your 18 year old self, despite your best efforts. For Lucas, Noah, Jessie, Abby, April and Tyler, their upcoming 10 year high school reunion keeps inching closer and making them realize all of this. Each of them wants to separate themselves from their high school persona, for different reasons, but things keep happening to make them even closer to their former selves.
In the autumn of their first year in high school, some incident spurred Tomomi and Kaoru to promise to be friends forever. However, at their present age of 41, the two of them have gone through different lives. Tomomi has built a happy family that everyone envies while Kaoru lives for her career as a movie producer. The differences in their lifestyles have created a distance between them. The two friends meet again for the first time at a class reunion after 20-something years and return to their former closeness. However, Tomomi has one suspicion. Kaoru knows too much about her own family. Is her husband and good friend having an affair? When Tomomi gets to the bottom of the matter, an inconceivable fate awaits her and Kaoru. The two of them are at the mercy of a harsh destiny, and before long, they learn what is hidden in each other's hearts.