The Unsmiling Swordsman

During the Northern Song dynasty, a strange swordsman appears in the martial world. He exclusively kills corrupt officials and bullies, but has a peculiar rule: before killing, he always says, 'Tell a dirty joke, and I'll spare you.' Yet no matter how much they joke or jest, he never smiles, and none survive. Later, he becomes known as the 'Unsmiling Swordsman.' Until he kills a seemingly insignificant corrupt official who has the most powerful backing. From then on, he is no longer a chivalrous hero but a wanted criminal hunted by the imperial court.