Mu YiZhen is Lord of JinLin's First son. His name mean first treasure.

He and his agnate brother, Mu ErPu, must compete for become a rightful heir of JinLin.

YiZhen's 20th years winter, Lord of JinLin have command, send him and the embassy to the north for contact with PingAn, neighboring region. But he know about his father's truely purpose. And he must complete this mission for prove himself, he worthy with the throne.