An unknown medicine was sold in a drugstore, and Rin's sister died. Her sister was not related to Rin by blood. (Rin is of mixed Chinese and German descent) is the adopted daughter of the family. Her parents have not yet agreed to the burial and Rin is dissatisfied. Rin creates an antidote based on the properties of the drug and is favored by Xiao Hexuan.
His parents were originally businessmen. After their business failed, they took refuge in a mysterious organization that manufactured drugs and started trading drugs. Unfortunately, Xiao bought the mutated medicine as a cold medicine and took it, causing him to be sent directly to the hospital for treatment. While he was hospitalized, he was taken care of by his senior sister Rin. After getting along for a long time, his junior student Xiao developed feelings for Rin, and Rin developed a crush on Xiao. After confessing, Rin hesitated, but after remembering what her sister said during her lifetime, they became lovers.
Lin was captured by a mysterious organization for drug transplantation, and Xiao decided to rescue her. What will be the fate of the two of them?