Mostly through objects that hold their magic, witches live for helping humans and granting their wishes, accepting common things in return, objects humans didn't care about too much.
That was their only function.
But what happens when a witch wants something, too?
Seungwan's had many wishes granted by a witch that lived in an alley, Joohyun.
However, she realized what she wanted all along, and came back to ask for it.
To ask for one more wish from the corner witch.