Artart

Idk it its even on this website but like its about a young adult man in a kind of zombie world. Its shounen ai or yaoi. The first scene is about him camping with his colleagues and one professor. The professor turns into zombies and the rest were ambushed with the zombies. The mc was also taken hostage by this gang of people and put him in a arena ish type with a cage. He found that when he dies he comes back alive to relive the exact scene but he can change what he did before he got killed. But as he keeps on reviving, he gets weaker. Then the other male ml shows up with his gang and infiltrates the group and that mc was unintentionally saved and left alone. The mc travels alone to find shelter and eats a dog treat. And was found by the ml again and joins the gang. He helped them from a zombie ambush and fainted again bc when he helped the gang he was revived again.