In 2012, Lin Shen, who has a dark red birthmark on his left cheek, witnesses his mother being "accidentally" killed by bullies while protecting him. Ten years later, he swallows a mysterious potion and falls into the Abyss System, where he repeatedly takes revenge in a purgatory of memories: red wine that poisons a class reunion, a data ghost that alters financial statements, a rusty countdown in a classroom...
When the bullies become instance NPCs, when police officer Su Man's violet brooch flashes with a code for time and space, and when his birthmark turns into a System brand that devours humanity...
He finally discovers that all the bullies have been turned into NPCs, forced to suffer in an endless cycle, and that the System is an energy farm created by the higher-dimensional Observer civilization to harvest humanity's violent emotions. As his revenge unfolds, he gradually uncovers an even more cruel truth: he is the dark half split off from the Observer's true self, and every cycle is a ritual of self-judgment. In the end, he joins forces with avengers around the world to destroy the Black Tower, uses his birthmark to turn violent energy into healing power, and brings human civilization back to life.
