This Assasin is a Son-In-Low

The king of assassins in the dark world, the leader of the Wolf Organization known as the 'Wolf King,' suffers a mission failure and returns to China gravely injured.

To fulfill his late father's wishes, he becomes a live-in son-in-law of the Feng family.

Now, he is no longer the Wolf King but Jiang Hao.

The former 'Wolf King,' declared dead by the dark world a year ago after a failed mission.