Isekai Yururi Kikou ~Raising Children While Being an Adventurer~ - Chapter 500:

Seo-Joon, who had been working to save money in order to pay off his dead parents’ debt and attend a hunter academy, ended up needing to spend all his savings on a surgery due to an unfortunate accident.In his moment of despair, a weird advertisement played.[You can also become an awakener!]He decided to register since he had nothing else to lose.[Mr. Kim Seo-Joon, welcome to Transcension Academy.]This hunter academy is on a completely different ‘dimension’ than the rest!In the age of private hunter education, you can also become a ‘transcender.’

Yohan wakes up ten years in the past, back when he still lived with his uncle and hadn’t yet lost his parents’ massage parlour. With a strange book filled with wellness techniques in his hands, he decides to live differently this time—more aware, more purposeful, and maybe even more fulfilled.

He is the master of six kingdoms. As long as he wanted, his cavalry is ready to wipe off any country.

Sagiri was born in silence, no cry, no breath, no heartbeat, until a pulse of ancient energy tore through the air and marked him as the last child of a dead people. Cold, disciplined, and frighteningly calm for his age, Sagiri has spent his life hiding a power even he doesn’t fully understand. He does not smile. He does not fear. He does not allow anyone close. Because the thing living inside him 'The Echo' never sleeps.