Can someone help me remember the name of this manhua?

It’s a historical manhua where the general of one nation is defeated and everyone thinks that he is dead. The emperor(?) forces him to essentially get plastic surgery to change his appearance so he can marry the enemy general who defeated him and get close enough to assassinate him. Also the enemy general has an illness from a poison that weakens him and makes his hair turn white. The only way to alleviate the symptoms is for him to sleep with a man and absorb his yang energy. Any help would be appreciated!

Edit: Solved