Sirius (1997)

Blurb:
The mighty Kingdom of Goguryeo is in midst of a war which has raged on for decades. In need of talented warriors to help lead their people, O’Rhang Yhun is sent on a mission by his master into enemy territory to find and bring back his eldest brother. However, just as O’Rhang departs on his mission, his master passes away, and O’Rhang’s jealous second eldest brother betrays him by claiming O’Rhang is defecting to the enemy. Having been branded a traitor, he is pursued and nearly killed. As fate would have it, O’Rhang is able to escape his homeland barely managing to survive when a maiden as beautiful and graceful as an angel saves his life.

Source: www.anisearch.com/manga/954