Lin Yan discovers that he has fallen under an absurd curse: when the sun rises, he is a quiet, reserved medical student, with half-eaten mints always tucked into the pocket of his white coat; when the moon comes out, the person in the mirror becomes a girl with shoulder-length hair, the chill of the day's scalpel still lingering on her fingertips.
He/she has to keep the secret hidden: the daytime roommate must never find the skirt under the bed, and the guitarist she meets at night must never recognize the matching scar on her wrist. But when “he” develops feelings for the aloof professor in class, and “she” is stopped at the night market by that guitar-playing boy, the world divided between day and night begins to tilt.
In the gap between day and night, what lies hidden: the struggle between two identities, or a single soul made whole?
By day, Chen Zhou is a new trainee at the police station. He follows senior officers to crime scenes and takes notes more diligently than anyone, yet always vanishes in a hurry before dusk. By night, Chen Ye is a mysterious bartender, able to read the worries hidden in customers' eyes with a brush of his fingers against a glass, but never staying past daybreak.
No one knows that Chen Zhou and Chen Ye are the same person.
Until a serial case spanning day and night emerges. At a daytime murder scene, someone leaves behind a clue that only “Chen Ye”
