[EN] I didn't know he's real

Elsa is normal, if you forget the fact she has ice powers which she can use to make whatever she wants, like a palace or a snowball. She hides it from the outside world and from her sister Anna because she doesn't want to hurt anybody. The only and last time was when she hit her mother who died of the accident. A hobby of her is writing, she finds cheer in it.
After a dream, which turned out to be a memory, Jack Frost, a naughty Guardian, comes alive. He tells that all other legends also excist, like Santa Claus. Jack is invisible for people who don't believe in him, but because Elsa wrote about him, he became visible.
While Jack learns Elsa how to control her powers, an enemy is watching named Pitch...