X & Ash 

X, a genius thief, and Ash, a boy with a mysterious past, decide to join the Azure Knights after a chance encounter with Ryu, the prime swordmaster. The entry exam for the Azure Knights is where the best of the best come to show exceptional skills. X and Ash must prove their might and win against the elite aristocrats! Will they be able to become knights? And what cruel destiny will they face afterwards…? (Source: WEBTOONS)