I'm in the Demon Suppression Division, and I Kill My Boss at the Beginning.

[Demon slaying + Krypton life practice + martial arts deduction + multiple female protagonists] During the Chinese New Year, demons are rampant and plunder the people. The royal family is corrupt and the princes dominate. Zhou Ye traveled through time with the system and became a clerk in the Monster Hunting Department. He was betrayed by his boss at the beginning and became the husband of a sow demon. When he was about to be ravaged, Zhou Ye activated the [Krypton Life System]. By consuming lifespan, you can deduce martial arts and improve your cultivation. You can also gain longevity by slaying demons. "After 50 years of life, your "Zhan Gang Dao Technique" is perfect and superb!" "After 300 years of life, your "Wind and Fire Sword Jue" has reached its ultimate state. You have understood the ultimate meaning of "Wind and Fire" and created your own "Cross Slash of Heavenly Flames"! "With 1,000 years of life, you will completely absorb the inner elixir of the Ghost Dragon Demon King and realize the magical power "The Hidden Abyss Ghost Prison"!" "Kill the thousand-year-old white tiger and gain 2,000 years of life!" ----- Some years later. Zhou Ye became the number one martial artist in the Great Zhou Dynasty and became the nightmare in the hearts of demons. The empress ascended the throne, the princes rebelled, and rebels from all walks of life entered the imperial city overnight. The building is about to collapse, Zhou Ye stands on the city gate with a sword and speaks. "Those who dare to cause trouble will be punished by the nine tribes!" And this matter starts with the empress's growing belly.