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I hope this is what you're looking for. Even if it's not, it's still a great read. https://www.mangago.zone/read-manga/goodbye_lilac/
unfortunately, it wasn’t that one :( but ty for the rec, i’ll def check it out!!
I read this years ago and didn't even finish it, but your description kind of reminded me of it, so is it this perhaps?:
https://www.mangago.zone/read-manga/mr_snail/
does this sound familiar to anyone? a story about a former student who became a teacher to reconnect with his school teacher who saved him after an accident he had as a student..i think the main character had orange/red hair and the teacher had black .. i only remember a few other vague details.. it was possibly a BL, or at least had hints towards it..