Sun Dashan, a bachelor, received the divine dog Wangcai as a gift from a mysterious immortal. Wangcai was actually the descendant of the sky-swallowing beast. He wore a divine chain, which had infinite power after being unlocked. The gang of dog thief Yang Shi was greedy and took away the wealth by force. His family ignored the warning and unlocked the chain. The demonized Wang Cai launched a bloody revenge and hunted down the perpetrators. At the critical moment, Sun Dashan rushed to lock up Wangcai again. Bureau 749, a mysterious national agency, intervened and invited the two to join. The story shows that good and evil are rewarded, and the kind-hearted Sun Dashan and the loyal Wangcai start a new journey
