Wesel, the Duke of Henia: the half-brother of the current king of the Henia Kingdom.
Despite his powerful abilities, he has no claim to the throne due to his lineage.
Jae: once dreamed of becoming a jewelry designer, but after an accident, he finds himself living a new life in a strange world and body.
After losing his family in an unexpected accident, Jay inherits a jewelry store in Jongno. Just as he begins to overcome his grief and stabilize the store, he is struck by a sudden traffic accident.
Worrying about who will inherit the store now, he closes his eyes, only to open them in a world that is not Earth, where the language, culture, customs, and even races are different.
In this world, a small mistake that would have earned him a slap in Jongno could cost him his head.
This is the world of Henia, where magic and gemstones are revered.
Awakening in the body of a weak and helpless thirteen-year-old, Jay struggles to survive in this unfamiliar world. The skills he honed in Jongno become a beacon of hope in this new life.

Omega-verse, Western-style, fantasy, royalty/nobility, class difference, beautiful protagonist, alpha protagonist, capable protagonist, mutual salvation, past life/reincarnation, jeweler.