After Alina had made her decision to accompany Kaizen to live outside the Wizards' Tower, the Guardians didn't even have the right to refuse. After all, although she was a citizen of their people, she had never lived in their society, and if she no longer carried the Book of the Founders sealed in her blood, as the oldest and only remaining member of the Sylly family, she no longer posed a threat to the safety of the Wizards' Tower.
Kaizen was very happy to have completed his mission to find and rescue Alina. He did not receive any great rewards, but in his mind, there was no better reward than having an NPC at his side who knew almost everything. Besides, Alina might be exhausted now, but she was definitely a very powerful mage and an important ally for the future.