When Gu Xinglan, a Chinese language teacher at a blind school, was correcting his homework, he discovered a strange Braille composition - a murder list hidden between the lines. When she tried to call the police, people on the list began to die mysteriously.
Shen Yan, deputy captain of the criminal police team, took over the case, only to find that the only clue provider was a "half-blind" Braille teacher. To make matters worse, he himself suffers from night blindness and has trouble walking in the dark. Two "blind men" form the most unlikely crime-solving partner, groping their way through the invisible truth.
As the investigation deepened, they discovered that each of the deceased was related to a campus bullying incident ten years ago. And the murderer seems to be hiding in the dark corner of the blind school, recording the next target in Braille...
When Gu Xinglan became the last name on the list, she had to use her touch to find the person she was most familiar with in a completely dark world.
