Manga General, You May Leave Now

The young general volunteered to go to war when his country, Beiming, was in peril. The expedition was dangerous and his future would be at risk. His grandmother arranged his marriage before his departure, in hope for a grandson to carry on the family name. Five years later, the young general returned home with victory, but who was the lady in white sharing a horse with him?
Five years ago, he didn't care about who he married, and neither did his bride, who only wanted a place t live. Five years later, the young couple met again. He was no longer an inexperienced youth, and she started to reveal her secret identity.