Lin Guangyu is a talented but lazy light mage. He has a rare affinity for the Holy Light, but he always neglects his practice due to his playfulness. In an accident, he summoned a Seraph with an out-of-character personality. From then on, his life became chaotic and full of jokes. Although he often complains about the unfairness of his fate, at critical moments, he can always resolve crises with his wisdom and courage. As the story develops, Lin Guangyu gradually grows into a responsible and brave mage, and finally reveals the secret of his life experience.