Xu Xingyan and Lu Yongming, childhood acquaintances, are bound together by a murder case. She is like a pistol shrimp, steadily rising into the light, transforming from a poor girl into the mistress of a wealthy family. He is like a goby, guarding her and clearing obstacles from the darkness, transforming from an aloof boy into a ghost of crime. For eighteen years, they move side by side through a white night, laying a path to the top with carefully planned schemes and cold calculations, until Lu Yongming ends it all with a decisive fall. In the end, Xu Xingyan walks alone through a desolate world forever deprived of the sun. Their twisted bond bears witness to the degradation of human nature and reveals the unbridgeable rift between light and darkness.