Jiangshi: I Was Lying in a Coffin from the Start, Then Awakened the Sign-In System

I was reborn as Master Ren, trapped in a coffin in Mr. Vampire, my whole body stiff and unable to move. My Walking Corpse attribute panel says I’m useless: I can’t even push the coffin lid open. On the first day, the sign-in System activates and rewards me with an indestructible body. Uncle Jiu brings his disciples to deal with me, and I punch straight through the coffin lid. From today on, Renjia Town answers to me.