Hyun-myung, Doo-yong- and Gun-woo decide to spend the night at their secret place at the pond to celebrate their last day of high school and Sung-pil’s sister Kyung-mi’s birthday. Later night as the party intensifies, Gun-woo and Kyung-mi go back home quickly to get something, however they don’t make it back. The rest go searching for them only to find Gun-woo’s broken scooter and Kyung-mi’s dead body near the verge of the town and Gun-woo is missing. Four years later, Hyun-myung comes back in town and runs into his old friends. Eventually the truth of the past unfolds.

현명, 성필, 두용, 건우는 10대 마지막 겨울 방학과 성필의 여동생 경미의 생일을 축하하기 위해 그들의 아지트인 '못'에서 하룻밤을 보내기로 한다. 늦은 밤 파티가 무르익어갈 무렵 건우와 경미는 잠깐 마을에 다녀오기로 한다. 한참이 지나도 돌아오지 않은 두 사람. 결국 아이들은 그들을 찾아 나서고...