In his forties, Ahn Goong Chul is the very picture of a content middle-aged man. He has a happy family life, a tightly-knit group of friends from college and he excels at his career. But a shocking incident will have a profound impact on his life. When the local golf coach is murdered, both he and his wife Jung Hae, along with his friends and their spouses, are all considered possible suspects. Goong Chul and his wife's relationship becomes strained as the trust between them erodes. Moreover, this murder investigation is reminiscent of an earlier one some twenty years ago that Goong Chul and his friends were also a part of. Will long-buried secrets come to light? Sensing danger, Goong Chul only wants to protect himself and his family, but can he hold on to what is most precious to him?