She wandered alone for more than four hundred years.
The essence of jealousy is the feeling of loneliness.
Wonderful love, sincere friendship, the respect of others, the success of a career...
First, her parents died early, forcing her to take over the company at a young age, depriving her of fun and entertainment; and when she devoted all her human energy and life to growing the company, she was betrayed and died, still very young; after she became the Son of the Moon, just as she was about to "come of age" and be accepted by her kind, she met the Shadow Demon.
For "Beyard," the Son of the Moon with all of Vinesse's memories, the Shadow Demon, as an avenger, was undoubtedly her only friend.
And perhaps the Shadow Demon was also in need of such an understanding being.
The fear of loneliness outweighed the challenge of fate. Perhaps for that reason, the two beings, who should have been locked in a fight to the death upon meeting, ultimately reached a reconciliation.