On his wedding day, Caelus Grayson is confronted by a prince and powerful sect masters. He activates a Check-in System and Double Pupils, marrying Livia Sullivan. He relies on the System to grow stronger. With his Double Pupils' abilities, he defeats prodigies, obtains legacies and treasures. He uncovers his own lineage as a descendant of a divine emperor, becoming the ultimate powerhouse who dominates the ten domains.