Sang Yung/ Sanyun (山伊 San Yun) is Aska's loyal servant and childhood friend.
Sang Yung is often much more thoughtful and studious than Aska (though he really doesn't look it) and hopes to one day assist her in ruling Fahren.
In the manga, there are slight implications of a relationship between Aska and Sang Yung.
- Sang Yung makes a short appearance in Tsubasa: Reservoir Chronicle as the Kudan of Masayoshi Saitou, and again in this form in the Country of Ōtō, working for Chang Ang in a sword shop.
- He shares his name with the SsangYong Motor Company of South Korea.
- Sang Yung is voiced by Barbara Goodson and Satomi Koorogi.