Some manhwa like the ghostly doctor
I’d say the closest is this, it’s medical and martial art but it’s male MC and has less romance
http://www.mangago.me/read-manga/doctor_s_rebirth/
Do someone know manga about rich young boy who fall in love with poor old man?
http://www.mangago.me/read-manga/the_place_where_the_wind_blows/?0MKU
He s not there yet , but he ll fall in love sooner or later
http://www.mangago.me/read-manga/himono_tokodoki_shanairen_ai/
Uke is not poor but the seme is much younger and acts dominative
Something like ghostly doctor