Responses
https://www.mangago.zone/read-manga/for_my_abandoned_love/ he wears his glasses on and off?? But he fits the rest of your conditions
https://www.mangago.zone/read-manga/ellin_s_solhwa/ although iirc, he only wore glasses in the early chapters
Historical josei/shoujo that the ml has long hair and glasses or a typical smart matured man ykyk