On your wedding night, you were ordered to sleep in the firewood shed, and then the whole house was involved in a murder case, framing you as a scapegoat - a son-in-law, you should throw it away after you use it.
But they don't know that what's hidden in your lowered eyelashes is something that can overturn the whole of Chang'an. This chess piece never dies if it refuses to do so. It wants to fight its way back to the center of the chessboard.
It wasn't until the day the curtain was lifted that they discovered to their horror that this meek son-in-law had become the sword-wielder. Redress the injustice? No, what you want is blood debt to be paid with blood, and power to rule the country.