Dianchi Sleeping Beauty.

After a primordial war leaves behind a powerful seven-colored spiritual pearl, Dragon Princess Ao Ling and Yun Yuan join forces to protect it from the demon clan. When Ao Ling sacrifices herself and loses her memory, the pearl shatters and Yun Yuan spends a thousand years searching for a way to restore it. Reunited centuries later in Kunmi, the two must face the returning demon forces and fight to protect the Three Realms, even at the cost of their own destinies.