I actually like this. If it were another manhwa, the seme would be a turn off for me but the way he acted got me wondering..why is he like this? Also he is evolved and since this is a world after the age of man filled with zombies.. I could understand why the ML is so unhinged. We can't use our common sense in their world, I didn't like him rubbing his stinky ass dick on our pretty MC's mouth but whatever. I knew something was suspicious because they insisted on him being his guard even though the MC has said twice that he wanted a different one. Also him being sent to the garden or some shit for drinking was a bit strange for me but I pushed it aside since I thought they probably didn't think much of it(the writer) and I considered it to be a typical yaoi. But a lot of thought is going into making this manhwa, like them putting the ML(the strongest person) by the MC's side and them keeping an eye out for him, like the higher ups are definitely shady people. The doctor who got killed must be an inside job but what's up with the MC's dream? I want to know all the info.. Like I am invested!
Also I don't think the MC lacks emotions, I think he is just a stoic person who never interacted much with others, also he is a mutant and mutants are usually obsessed with something.. In his case 'stones'. Him being called 'Dr Stone' made me wonder if it was a shoutout to the anime/manga 'Dr Stone' but it turned out to be a play on words. I'm also glad that there is more to the ML, like he seems to be super serious in the scene where he looked over that Dr. Oh and our MC and he has access to the Top Class secret so...
Rainbow City