In Qinghe City, a series of murders broke the peace of the city.
Real estate boss Zhao Lei was found dead in his office, with his tongue cut out and the words "I'm guilty" written in blood on the wall. Interpol Chen Guodong took over the investigation, and subsequently many victims were killed using the same method. They had a common identity - classmates in a high school fifteen years ago.
The clue points to Lin Xiaoyu, a girl who was bullied by these people until she became speechless. She is silent, quiet, like a ghost, but all the evidence points to her. However, she has a perfect alibi and the case is deadlocked.
The truth is far more complicated than imagined. Li Jun, who was also bullied back then, is now a surgeon. The two people who were harmed by fate joined forces to take revenge fifteen years late.
However, when Li Jun committed suicide, Lin Xiaoyu was arrested, and the case seemed to be solved, a letter from Lin Xiaoyu revealed an even more shocking secret - there were far more than four bullies, and the real mastermind was still at large.
Some people are silent not because they have nothing to say, but because their words must be written with blood.
