So, I Married My Bro

[Both transmigrate + gender-swap transformation + a showdown at Xuanwu Gate]

After a car accident, best friends Gu Heng and Fu Tianxing transmigrate to the nonexistent Great Sheng Dynasty.

Faced with a perverted crown prince who makes pills from children and a foolish emperor who only cares about pleasure, Gu Heng finds his old friend. “Want to team up and do something big?”

Fu Tianxing, a cross-dressing powerhouse, slams the table. “Sure! Do we copy Er Feng with just eight hundred men, or follow Zhu Di and launch a Jingnan Campaign?”

When Gu Heng ascends the throne as emperor,

he realizes that, looking at his old friend's outrageously beautiful face, his heart just won't behave!

Fu Tianxing looks thoroughly annoyed. “We agreed to build an empire together. Why are you secretly thinking about marrying me?”