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Jin-soo (Lee Jung-jae) works as an anchorman for the local weather channel. After a car accident, he develops a curious case of selective amnesia. He finds clues of a past relationship, and finally decides to search out the identity of the woman he loved, with the help of friends and past acquaintances. Yeon-hee (Jang Jin-young), herself trying to erase and forget the memories of a love she once had, seems to be the only one who's helping him seriously.

A wave of gruesome murders is sweeping Tokyo. The only connection is a bloody X carved into the neck of each of the victims. In each case, the murderer is found near the victim and remembers nothing of the crime. Detective Takabe and psychologist Sakuma are called in to figure out the connection, but their investigation goes nowhere. An odd young man is arrested near the scene of the latest murder, who has a strange effect on everyone who comes into contact with him. Detective Takabe starts a series of interrogations to determine the man's connection with the killings.

In 1940, Masaaki Takaoka works as a teacher in the agricultural division at a youth training institute. Although Japan’s defeat seems immanent, all of Masaaki’s students are drafted in a futile last-ditch effort. In an attempt to give the young men some hope, he makes everyone promise that they will all meet again under the cherry blossoms upon their safe return. Consumed by sadness over the fate of his students, Masaaki devotes the next 30 years of his life to develop a new species of cherry blossoms that could thrive in any climate in remembrance of his students.

It's a story of one night where estranged lovers Kartik and Vasuki end up meeting each other after 12 years under strange circumstances. Kartik is on a run for being a murder suspect. However, there is more than what meets the eye.