Tales of Demons and Gods S01

In his previous life, despite being so weak that he couldn't protect his home when needed, he became the strongest demon expert and leader of the martial world due to his unwavering determination. Although he lost his life in a war against a wise emperor and six divine gods. Then, his spirit was sent back to when he was 13 years old. Despite being very weak and lacking sufficient physical potential, he utilized the knowledge he had acquired in his previous life to progress faster than others expected. He resolves to prevent the terrible future that awaits him and protect his dear loved ones.