Tensei Shitara Slime Datta Ken (WN) - Chapter 409

I’ve possessed the mid-boss who tortures the protagonist and receives true education.Am I crazy? How dare I do such a thing to the person who is supposed to be the protagonist?I even planned to treat all the protagonist’s friends hospitably…“Everyone, wait for me! I will definitely become stronger and come to save you!”Oh. Running away.

The unparalleled Demon King Ye Xuan, who was able to heal the death or the living alike and holder of the medicine Holy Scripture, was betrayed and killed by his fellow Demon Kings. But he reincarnated into the body of Ye Xuan, the prodigal son of the Ye family and vowed to himself that he would return to his peak and take back everything that belonged to him!

- Description from Novelupdates

My name is Joo In-gong. The name that my parents gave me meant ‘protagonist’ of the world. Really?

The heir of a border lord sacrificed his life in battle, hoping to repay the lord’s kindness, but his efforts were in vain.However, when he opened his eyes again…“I’m… the First Prince?”He had taken over the body of the notorious first prince.The only problem… this guy was going to die soon.