The Crimson Blade

Yeoran is a wandering warrior, whose sole mission in life is to find the demon that killed her father. One night, she finds herself warped into the demon world, having to save Princess Jaha from being married off to the Demon Master. There, Yeoran discovers traces of her father, bringing her one step closer to finding his killer. To find more answers and fulfill her lifelong mission, Yeoran becomes Princess Jaha's bodyguard. Will Yeoran finally be able to find closure? (Source: Webtoon Entertainment)