Cai Jing is the Chancellor of the Great Song Dynasty and one of the notorious Six Traitors of the Northern Song. He is a grandmaster of the Celestial Phenomenon Realm, the fifth major realm of martial arts. He is the father of Cai Yun and represents the powerful bureaucratic faction in the imperial court. His residence in the capital is a center of political influence. Though not directly involved in martial conflicts, his background and resources shape his son's arrogance and the power dynamics among the younger generation.