Mo Hai followed his master's dying instructions to lie low in the Dead Prison for three years. Three years later, commissioned by Number 1, he left prison to protect Qin Lan, the eldest young lady of the Qin family who holds half of the longevity cipher and is being hunted by the Futu Society. To investigate the truth behind his master's murder, he joined the Qin family as a security guard and also selected ten masters from the Dead Prison to form the Ten Elders Association. Along the way, he successively defused assassinations and commercial suppression, and Qin Lan gradually fell for him in reliance. Tracing the clues left by his master, Mo Hai ferreted out the leader of the Futu Society and executed him, guarded the longevity cipher, and finally stayed together with Qin Lan.