He found out his best friend was a door right before he got shot...he asked Cain to heal him before Sid kidnapped him from the hospital...now he has been looking for him on foot, prob everyday. What more do you want? See pp 44-46 again if you missed it.
http://www.mangago.zone/read-manga/dear_door/mdx/mpn_chapter-2301699/pg-44/
I was about to say the exact same thing.
When he learned about his bestie's change in personality, they immediately had an operation so he could not do something about it yet. And then the operation went crazy ending in them both getting injured. Even though he was shot, he was still worried for his best friend. And then the moment he woke up, his first thought was if his best friend was okay. He even immediately told Cain to go to his bestfriend because something is wrong. I don't know about the other people, but I'm pretty sure this is what a good friend does.
Getting shot by your best friend himself but still worrying about him, then waking up from the hospital but your first thought is the well-being of your best friend, and then telling your demon bf to go to your best friend because something is wrong is, I think, what a best friend would do though.
Also, the moment he knew of the massive change in personality of his best friend was immediately followed by an operation, which lead to them getting injured and hospitalized ultimately leaving him no time to "do something about it".
I don't mean to fight but I think you're being too harsh on him.
Oh lordt part of my thing is missing and why doesn’t he ask Cain to locate him isn’t he like the big shot or something?
^ it’s a genuine question
Plus isn’t it Cain’s subordinate (or whatever Sid is) that’s the brown hair guys door wouldn’t that make it easier and smarter option to look for him rather than on foot everyday like he’s doing. He was kidnapped he could be anywhere for goodness sake and anyone who truly truly truly cared and was worried would’ve want him to be found in the quickest way possible.
And as you said he found out he was a door before he got shot, why didn’t he go talk to him( brown hair guy) and he (the brown haired guy) was acting strange way before he found out he (brown hair guy)was a door.
Just what I’m saying is considering that he had Cain on his side, he could’ve done more.
Oh okay I understand what you are saying and you’re not fighting you’re just stating your opinions like I was doing.
Also part of my thing got cut off, idk why but what I said on the part that cut off was “ even tho he’s worried and thinking about it not a lot of actions are being done” (it’s not word for word but that’s basically what I mean)
The thing that stood out most in your comment was "he barely put any effort into trying to find out what’s wrong with his “best friend”" which I think was too harsh and unfair because he literally only a few moments after he learned the thing about his best friend, they were attacked, injured and hospitalized. He really didn't have the time to do so.
Also, as a response to your other reply, Cain is a big shot for sure but he's not all powerful. He even needed a compass to look for a demon doctor and he didn't even know that Sid is actively betraying him. Furthermore, the MC could not ask Cain for help since he was in the underworld and the MC has no means to summon him at will. Sid is a subordinate but he's quite powerful too and Cain has no absolute control over him so Cain can't really do much at this point.
Sid obviously found a way to block out any attempts Cain would have made to locate his door...Sid did talk about the spell he placed on the building they are in. Seriously, what a lame comeback. Sid has been double crossing Cain since the beginning of this webtoon, you think he doesn't know how not to get caught by his superior? Some things can be inferred by the story context.
Joon did not go thru what is friend did with his demon. Sid was mind-raping him from the get go Cain was way more gentle. Joon had no point of reference for changes in his friend's appearance nor behavior but he did show concern, you know, as a friend. As I said everything clicked when Joon realized his buddy was a door then like 2 seconds later he gets shot..
What you originally said was you didn't believe they were best friends. I'm not clear on what actions a best friend vs friend vs acquaintance would take here that would satisfy you. Joon has defended his boy's actions at work even though his disappearance is mad questionable and after a long day of policing, he walks the beat trying to find him. Acquaintances don't do that sh!t. Friends would have probably left it at reporting him missing and trying to reach out by phone or text. Best friends work and worry themselves to exhaustion..wait, that sounds LIKE JOON! But hey that's my opinion.
In my prev comment I asked you to clarify what actions a bf vs f vs acq would take here that would satisfy you? Then I listed examples frm my PoV with evidence from the story to back it up. It was an attempt to try to understand why you don't see them as bfs.
Btw Joon is an MC and his friend is the 2nd male lead...the doctor is an example of a side character...you can tell by which characters get both spotlight and development

I refuse to believe they are best friends, they are more like friends or they even be acquaintances. cause in no way his “best friend” started acting strange(not just some one or two day acting funny, a full blown looking paranoid to the point he even looks sick) then was told he was multiple scratches on his back by his colleague and then went missing for a week after he Shot himself and he barely put any effort into trying to find out what’s wrong with his “best friend”