System: I Can Kill All Viruses

By chance, a young master from an aristocratic family becomes the son-in-law of a rich family's daughter. Although the two pretended to be married, the protagonist fell in love with his wife, so he began to gradually attack his wife. But suddenly one day the spiritual energy revived, and the enemies that had been defeated turned into plague demons. In order to take revenge, the plague infected the protagonist's wife. The protagonist defeats the final virus and saves his wife, wife and children. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.