Suterareta Yuusha no Eiyuutan - Story 2-15: 『Demon Killing』

A million years ago, he had traversed the Nine Heavens and Ten Earths, braving countless mysterious Life Prohibition Zones, in search of a way to resurrect that foolish woman, but inadvertently learned one earth-shattering secret after another. Thereafter, he went through nine cycles of reincarnation, strategizing over the world, casting his net across the heavens, with the Myriad Realms as his board! In this life, he had returned from reincarnation, his Qi engulfing mountains and rivers, “It’s time to close the net...”

“Jiang Yu transmigrates into a novel and becomes a side character in the book.

As an Alpha, Val is required to find his Luna as quickly as possible. But when he finally finds one... she seems too young to be his mate?***Elyna thought her life was over when her pack was attacked and she was sold by hunters. With no experience mixing with humans, everything was scary for her. Only Val's presence could make her feel at ease. But unfortunately... Elyna could sense that Val secretly hated her.People said it was because she was too young for Val. But she was actually hundreds of years old though?