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It's actually quite similar to one I read before. A Chinese bl novel called 'The Hunted'. It has many chapters I can't even finished it tehe. The ML is a powerful demon entity who is obsessed with the MC who is can see supernatural entity and ghosts and harm him. But the demon s a ghost because he died though, is protecting the MC from the evil spirits. They were actually reincarnated 3 times but because of the ML being the strongest demon they happen to find eachter other again again.