Lei Qian

He is the late Emperor of the Yan/Fire Country. Jun Wu Xie found a stone house in the Heaven's End Cliff and she found a letter in the wall of how to become a Purple Spirit temporarily. Because of that she acknowledged the late Emperor as her Master (in spirit).

Later when Jun Wu Xie went to Fire Country she found out that the ring she found in the stone house was the Ring of Imperial Fire and anyone who wore it was to ascend as Emperor. The reason for this is because when he went missing his younger brother took the throne but made an Imperial Decree that the throne must be abdicated to the person who wears the Ring of Imperial Fire as they were the rightful ruler of Fire Country.