Qin Feng, the Dragon Group's top special agent codenamed the Living King of Hell, resolutely retires from the dangerous world after his wife unexpectedly becomes pregnant. For five years, he suppresses his bloodlust, transforms himself into an ordinary stay-at-home husband who cooks for the family, and devotes himself to protecting his wife and child so they can live in peace. Unexpectedly, his sister-in-law suffers brutal bullying at the hands of the Black Dragon Society. To protect his family, Qin Feng, who has endured and hidden his true nature for years, finally stops concealing his identity and reveals his astonishing power.