Certa is the Captain of Yeohadan and a member of the Tessera. His jurisdiction is "wherever Yeohadan's shadows reach." Certa is also the boy Melly is looking for.

He seems very distant and intimidating on the outside, but we see his soft, kinder personality later. Known to be secretive, especially about his past.

On February 29th, children under the age of 14 are said to have their wishes granted on a day known as Melly Day. In a world where humans are said to be blessed by the gods, Hiasen has been granted the ability to manipulate mana in his dreams... but all he really wants is to see his mother again. When his wish is granted on Melly Day, the world as he knows it changes forever.<br><br>(Source: WEBTOONS)