Alpha's Mismatched Mate

Ella is her name. She's just an ordinary girl. Oh, wait, is she really as ordinary as we presumed about her?
Allora, you can't guess it right. For she herself didn't know about her true identity.
Living in a ramshackle hut with an old man with whom she had no blood relation. There's nothing extraordinary about her lifestyle or even her. She wakes up, prepares breakfast for both of them, and then the old man leaves for food hunting. They're living an extremely poor life which is a common status in her surroundings.
And one day she had a mysterious dream, the one she had never thought of. Not even in her dreams!
Her 18th birthday was coming right after two days and she's having his dream as a present.
Well, a present is worth it all.
Forest, wolves, handcuffed maiden, and the demand.
A two-word demand, asking for the keys.
What keys those strange, voiced creatures were asking for?
Whose keys?
She didn't know but soon she will know.