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I don’t remember the name but I have screenshots from the series and I just wanna reread it. It’s a Manga rather than a manhwa /manhua. From what I remember it’s about an s rank mage becoming a teacher as a favour and he doesn’t tell the class his true identity. The mc was a man with close cropped hair and a pirate-y looking jacket. The only screenshot I have with a character name is the mc addressing a girl with pigtails as ‘Akris’

If anyone recognises the series I would be very grateful