Nie Li, who was too feeble to defend his home in his past existence, conquered his weakness through perseverance and became the strongest Demon Spiritist, attaining the highest position in the martial world. Regrettably, he lost his life battling the Sage Emperor and six deities. Fortunately, his soul traveled back to his 13-year-old self. Although he had the weakest aptitude in his class with only a red soul realm, he possessed extensive knowledge from his past life and pledged to train harder than ever before. He also pledged to aid those who died bravely in his earlier life by supporting them in their preparation. Nie Li kept a clear objective: save the city from demon beasts, prevent its ruin, defend his loved ones and fellow citizens from the previous catastrophe, and get vengeance on the Sacred family who forsook their duty and betrayed the city in his past life.