情感真挚动人，让人为之哭泣，通过角色的故事，传递了关于爱、失去和希望的普世情感。Inanearfuture,crimesandaccidentscanbepreventedbymakingjustonephonecalltothepast.However,thepeaceofthisutopianworldwillbedisruptedbyamethodicalkillerwhoseemstohavediscoveredtheonlyflawinthissystem.
