Eighteen-year-old Lin Mo is an almost transparent existence in Qingnan Middle School. Introverted and cowardly, he has long been the target of wanton teasing and bullying by a small group headed by Zhang Hao and Li Qian. Endless humiliation settled and fermented in his heart, but he always chose to endure it, until an extremely bad trick pushed him completely into the abyss of despair.
Since then, strange "fragments" began to appear in Lin Mo's life. He often loses his short-term memory, and at the same time, those who have hurt him encounter precise and unfortunate "accidents" one after another. He found that there would be inexplicable scars on his body and items that did not belong to him would appear around him. In fear and confusion, through a video he accidentally recorded, he glimpsed a strange self with cold eyes and ruthless methods - a second personality born from his endless pain: "Shadow".
"Shadow" is calm, intelligent and absolutely ruthless. Its sole purpose of existence is to exact revenge on all those who inflict pain. From arrogant bullies, hypocritical bystanders, to derelict teachers, and even the source of the entire distorted environment... A cold and thorough reckoning quietly unfolded. Lin Mo struggled between fear and the pleasure of revenge, and was forced to coexist with this dangerous "self", and was drawn into a deeper vortex step by step. When revenge reaches the final bottom line, Lin Mo must face an ultimate choice: Should he completely sink into the darkness of "Shadow", or should he try to control this power and find a real future for himself?
This is a dark story about humiliation, awakening and redemption.