The Bored Samurai 1983 on netflix

Saotome Mondonosuke is Hatamoto (a high-class warrior who is allowed to see the Shogun in person) who has a crescent-moon-shaped scar on his forehead with flashy clothes and a handsome face, and is proficient in all the military arts and called Bored Hatamoto. Mikijiro Hira acts as such a hero in history. Mondonosuke is secretly ordered to look into the suspicious movement in Nagoya castle by the Ometsuke, and he found out about the misconduct and sole it. This is a period movie about the hero!