He's Obviously the God of War but He Has to Pretend to Be Useless

Lin Yi, the guardian of Daxia and the supreme commander of the Daxia National Defense Force, was a little-known soldier ten years ago, but within ten years he became the supreme commander of Daxia's military attachés. This was inseparable from his terrifying strength. However, one year after he reached the peak of his power, he suddenly resigned from all positions and disappeared. Since he usually wears a mask to show off, no one knows what he looks like except the people he trusts most and those who are at the top of Daxia's power. With the disappearance of Lin Yi, a new son-in-law named Lin Yi appeared in Heijin Province in the southwest of Daxia... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.