Possible spoilers below
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Yeah, I mean, he was obsessing over ML for the longest time, even longer than most readers would assume at 1st. If he was disruptive ML would def realize it sooner instead of starting to notice stuff after long years. Other borderline creepy but romantic things MC did were exposed after they got together already so ML was ok with that lol Anyway I love obsessive and stalkerish bottoms so Idc how much of a weirdo MC is, but Imo readers shouldn't blame ML for being cold and testing MC since he WAS suspicious all along
And that's how you recognize good writing lol The author made him so sympathetic that readers just go along with whatever he does and cheer on him. When I was reading the novel I caught myself many times thinking 'Chen Wan you're loml but it's kind of creepy' especially at later parts where some other things from the past get revealed.

I enjoyed the original novel so much, it's one of my fav pairs and I love both MC and ML. That being said, let's not forget that MC is a literal stalker. Personally I consider it as a part of his charm lol Especially since he is selfless and does everything to not disrupt ML's life, but it doesn't change the fact that he's very obsessive and did many others stalker-ish things through the years.