Yan Jun and Gu Yanli are twin brothers. In a car accident, the younger brother, Gu Yanli, is fatally injured, while the older brother, Yan Jun, falls into a coma. After waking up, Gu Yanli's wife, Sheng Huai'an, keeps noticing subtle differences between Yan Jun and the way he used to be. Later, she learns that Gu Yanli has died, and Sheng Huai'an develops a mental illness...
