A Mysterious Visitor

Jin woo (From solo levelling) Has to gather the main characters from other worlds in order to face the biggest threat to the multiverse, an army of 2 million Dragons

Story starts with Beginning after the end verse where Jinwoo came with Hanbin, Ephyr, Atisse, Sir Leonhart and Zhang luxin. They visit Xyrus Academy to meet a certain Quadra elemental mage.