Hai

Hai is a young boy shrouded in mystery who primarily travels with Sulryym, the ice-wielding medicine general. Despite his unknown background, he displays a highly innocent and caring nature; for instance, he looks completely blissful while sitting on Sulryym's lap during car rides, and he even affectionately spoon-feeds her the warm porridge provided by Hakkon (the vending machine) while calling her "big sister". His existence holds profound meaning for Sulryym, and their heartwarming bond becomes a crucial turning point that ultimately leads her to betray the Lord of the Underworld to protect her new companions.