I read this novel a few years ago, and I enjoyed it. I wanted to find it again to read it, but I can't find it despite searching most places I've typically used to read BL Novels. It is a Sentinel and Guide BL novel, where the MC is a guide who works in a hospital, seemingly low-level. (I think he worked in the C grade department?) However, he had a high rating with a high-class Sentinel. I can't remember if he was a Marshal or someone of similar rankings maybe just not as high? Though he can help ease his mental issues and all that jazz. I can't remember much else other than that. Though I'm fairly sure that the MC was not transmigrated, nor was the ML. As a side search, If you have options for BL Novels of Sentinal/ Guide Parings, I'd also take a look. Even if it's one I've read before, I don't mind rereading the really good ones.
I did find that one, however, it is not the same. The MC is not transmigrated. Though that BL was a good read as well! You know, It might be this one, but I don't remember reading it as a comic... Though its been a while... Maybe I'm remembering wrong? I'll give it a read regardless, thanks!
You know, It might be this one, but I don't remember reading it as a comic... Though its been a while... May Agreed, I've read it 3 times.
I heard that there's novel too but I didn't find it here on NU by this name. https://forum.novelupdates.com/threads/b-grade-guide.147240/ You can find some more info here.
99% sure this isn't it but here you go : After The Breakup, I Became The Marshal’s Wife Your description really does seem like Interstellar Super Doctor but sadly I don't know that may guide/sentinel novels
Theres a arc in Heroic Death System where the two ML are sentinel and guide. It's not the main focus of the whole novel but it is a short part of it