Eternal**

Muchen, a legend from the Kyushu Continent, was betrayed by his brothers and died under the mysterious abyss with hatred. He was reincarnated because he found a mysterious ancient book under the abyss. Although he was reincarnated as an illegitimate son of the Mu family who was bullied, he used his previous life's attainments, concentration skills, and magic elixirs to go against the will of heaven and take revenge.