Shen Mi, a 25-year-old blind girl, was born with a gray-white pupil in her left eye and a normal right eye. She was originally just an ordinary piano tuner in a welfare home, until her twin sister Shen Yao (an auxiliary police officer from the criminal investigation team) mysteriously fell to her death, and the police ruled it a suicide.
Shen Mi firmly believed that his sister was killed. While sorting out her belongings, she accidentally discovered the cornea donation agreement left by her sister. After the successful transplant operation, Shen Mi regained her sight, but she discovered that there was something wrong with her left eye - when she was emotional, her left eye would occasionally flash back the fragmented images she saw in her sister's last days of life. She must rely on these "memory flashbacks" and join forces with her sister's most trusted captain, Lu Chengyuan, to dive into the dark past and find out the truth.
