After losing his wife and daughter in a horrific accident, Yun-Jae finds himself stuck in his routine until he receives a diary from his future self. "I can see my wife and daughter again?" Through winning the "games" in the "parallel world," one will receive a "prize," and using this, he could revive his dead family but out of all the survivors of this cruel world, Yun-Jae is the only one with the knowledge of the future. Will he be able to turn his greatest wish into reality?