After I Died, My Sister-In-Law Made My Body into a Corpse

I finally traveled to another world, but I was very unlucky to travel to a dead body. What's even more unlucky is that he is turned into a zombie by his sister-in-law who has a crush on him. But fortunately, I got the 'Invincible Zombie King System', and I got the essence and blood of the ancestor of zombies at the beginning. Then step by step he became the invincible corpse king. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.