I'm No Longer a Human Being

Mark reincarnated into a cell, evolved into a prokaryotic organism for thousands of years, and evolved into a eukaryotic organism for tens of thousands of years... Countless years have passed, during which time he has evolved into various plants and animals. Because his body is a cell, it is difficult to truly die... Until one day, a prodigal son who was escaping from debt happened to pass by here...