There are different kinds of wizards:
royal-blood wizards, pure-blood wizards and half-blood wizards. All royal-blood wizards are pure-bloods. They have powers that only royal wizards can have. Their capability to use spells is better than normal wizards.

Pure-bloods can be divided into two categories: pure wizard , and half-wizard half-witch. Because of the feud between wizards and witches, none of the witch generation can live in the wizard world.
Half-blood wizards are half-wizard       half-muggles. Some of them live in the wizard world. Some live in the mortal world.

Wizards use wands. Hand magic can be used for easy spells. But royal-blood wizards can use hand magic for hard spells, too.

Wizards do not choose wands. Wands choose wizards. Using other wizard's wand will cause no effect. Only when one wizard wins another in a fight, he can use that wizard's wand.

Sceptre is the most powerful wand. Only the Queens can use it.

A long time ago, the battle between wizards, witches and muggles caused the death of all royal-bloods. Kim Taeyeon is the only survivor. Royal-bloods can merry only pure-bloods. Only then, their child can take the throne.

Taeyeon and Sunny are same-age friends. Yoona and Sooyoung are a year younger than them. Sunny and Sooyoung are Taeyeon's confidantes.

A day in wizard world is equal to two weeks in mortal world. They aren't immortals. But they age so slowly. So, for those from the mo