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A former professional baseball player, Byeong-wu, made a successful career transition into a high-flying insurance advisor, thanks to his keen business sense and quick wits. One day, he is summoned by police during an investigation, where the daughter of a former client who took his own life confronts him. She furiously accuses him of not doing anything to stop her father when he consulted him about insurance payouts in case of death by suicide. Byeong-wu storms out, saying there is nothing one could do to stop someone determined to end their life. However, Byeong-wu is subject to an internal investigation as the number of insurance claims on suicide starts rising among his clients. Byeong-wu runs through his client list and finds a suspicious group of people introduced to him by the same person—and starts visiting them one by one.