Oh My General (2017)

Both FLs are women who are smart and and raised from an early age to be the Commanders/General of large armies to protect China's borders.

Here we have the same gender-bender genre from the folks that brought you Go Princess Go. Some of its actors appear in this as well, namely male lead Peter Sheng as the devil-may-care man-about -town prince dandy betrothed to a decorated army general with a big secret- she’s a woman.