Responses
http://www.mangago.zone/read-manga/cheonsaeng_yeonbun/
It may not be very similar, but here the girl pretends to be a boy, and the story is very entertaining!
http://www.mangago.zone/read-manga/biyaku_cafe/
and this is very smutty one, but the protagonist seems like a guy and everyone confuses her.
Please recommand me manga like Vitamin C Victamin D