Hero (2004) on Netflix

During the bloody Warring Kingdoms age, only the ruler of Qing stands a chance to unite China into a single peaceful empire. To survive, the six rival send hired martial arts grand masters to kill the Qin king. Nameless, a modest provincial mandarin, tells the king during a private audience, at an exceptionally close distance awarded only to who delivered him of such killers, how he eliminated first spear-wielding Sky in duel, then the lovers Broken Sword and Flying Snow during the siege of their realm, Zhao. The king however responds he sees trough an elaborate plot involving Nameless, only to be equally surprised himself.