Jiang Lian enters a dungeon game by a fluke to find the truth behind her sister's disappearance. In the first dungeon, she encounters Shi Jin, the dungeon boss disguised as a player. At first, the two guard against and scheme against each other. Relying on her caution and daring, Jiang Lian survives in the dungeon and even wounds Shi Jin, unexpectedly making him develop special feelings for her. In subsequent dungeons, Jiang Lian joins hands with other players to deduce the truth and exposes the secret that Zhao Jun, the village chief's son, is the Nian beast. During this time, Shi Jin follows all the way, repeatedly paying covert attention and even offering help. After experiencing two dungeons, Shi Jin's interest and possessiveness toward Jiang Lian gradually increase.