Don't Mess with the Bodyguard

The male lead, who appears to be a country bumpkin, is actually an unparalleled master. He comes down the mountain to search for his family. The villains dismiss him and plot to poison his father to seize power. Unbeknownst to them, the male lead has already reunited with his father, and the two are putting on an act together. The villains suspect the male lead is the illegitimate child from years ago, but a DNA test proves he is not. The villains fall into the trap jointly set by the male lead and his father and get what they deserve.