Yurul

The storys Deuteragonist Yurul was raised as the younger son of the leader of the Tsog tribe which is under Mongol control but is secretly a son of the Khan. As such he was groomed from an early age to be a scholar with the hopes that one day he could be used as a bargaining chip to improve the Tsogs power. Fascinated with the words and cultures of the enemies his tribe stamps on as they advance and hating the violence and brutality of the plains Yurul decides to run away from his home determined to save as much culture as he can from the Tangut even a bit. Helped by Boldo he discovers an immense treasure hidden by his adoptive mother nine slabs of jade engraved with Tangut letters known as the Voice of Jade. Setting out to deliver them to safety he meets Shutohel and finds his destiny intertwined with hers. Source: TV Tropes