Shen Qingci, a scholar from a poor family, went to Beijing to take the exam. On a rainy night in a barren mountain, he encountered the seriously injured killer Ling Ren. One is as gentle as a lamp, and the other is as cold as a blade. They are people with different paths, but they are forced to go together because of an accident. The killer protects silently, the scholar tenderly redeems, and the knife in the darkness is finally illuminated by the warmth of the world. As the pursuit comes, the mystery of their life experience emerges. The two depend on each other for life and death amidst murderous intent and tenderness. They put aside killing and fame, and watch the fireworks in the same house together, with the green lamp as their constant companion, and the cold blade returning to their hearts.
