I Am the Only Man Left in the World

A mysterious virus suddenly broke out around the world. The virus accurately attacked the human Y chromosome, causing men around the world to die one after another in a short period of time. Wang Lei, a civil engineering drawing dog, accidentally traveled to that world and became the only surviving male on the earth. From then on, he took on the important task of human reproduction and spread seeds all over the world... A few years later, the descendants of that world called Wang Lei their ancestor.