Responses
Would it by chance be Cultivator Against Hero Society? Not sure about the martial artist and black hair but a teacher, yeah
https://www.mangago.zone/read-manga/cultivator_against_hero_society/
OMGGG THANKYUSOMUCHIEEEEEE
(つ˘◡˘)づ
So like the mc was a martial artist then he gets transported? Into a modern world then he becomes the strongest in that world then he became a teacher also the mc has long black hair? ┗( T﹏T )┛