Yami ni Nemuru Kishi

Sian, a descendant of an infamous rebel, never had the opportunity to learn the manners of a noblewoman, and her brother is constantly critical of her. One day, while taking a break from her suffocating situation, Sian is attacked by a boar in the forest. But she's saved by a one-eyed knight, who shoots the beast with an arrow. He's a scary-looking man with a scar on his face, but Sian is immediately taken by his kindness. She falls for him, but little does she know her love might never be reciprocated... (Source: Renta!)