[1V1, not a cool article! The male protagonist is very strong and the female protagonist is not weak either! !
[It's not a double heroine, the label is wrong! !
[It will be a bit cruel...]
He "died" protecting the country,
Because of her "loyalty to the emperor", her family was ruined, and she happened to exchange identities with others and saved her life.
He was the god of war, who was jealous of the king and died in a foreign country;
Her father had been fulfilling his duty of loyalty to the emperor all his life, but due to the emperor's jealousy, his family was ruined.
She was careful at every step, and he was careful about everything. By a "chance", he discovered that she was just like him, and she also discovered his goal.
The mountains and rivers were in turmoil, and the dynasty was destroyed. He took her revenge and also avenged his.
He joins hands with her to ascend to the supreme position and create a clear sea and river!