The Strongest Overbearing Son-in-Law

The renowned God of War of the Northern Frontier is his underling. The King of Mercenaries, feared across the seas, calls him his king. The ruthless King of Assassins calls him big brother. He is the Lord of the Hall of Yama, a man whose command can shake mountains and split the earth. And yet, he willingly became a live-in son-in-law, all to protect his wife and child.