The Last Rhee Witch by Jenna Lee-Yun

From Disney Hyperion:

For fans of The Last Fallen Star, Witchlings, and Ghost Squad, a heartfelt middle grade debut where Korean folklore is all too real and summer camp includes a gwishin haunting.

You couldn’t hold onto everything and everyone. You had to choose. And Ronnie only had two hands.

Since her mother died when she was five years old, it’s always just been Ronnie Miller and her dad. Two Korean Americans who, thanks to Ronnie’s dad’s adoption by white parents, have never felt all that Korean. But Ronnie is okay with that—as long as she has her dad and her best friend Jack, Ronnie is 99% certain she can get through anything.

But as much as she wants everything to stay the same, the world—and her dad—has other plans. Now, Ronnie and Jack are headed away to sleepaway camp for the first time ever. Camp Foster promises all of the outdoorsy activities that Ronnie has so far managed to avoid: ropes courses, scavenger hunts, kayaking on the lake. Ugh. But she can do this. As long as she has Jack.

As it turns out, an old manor in the woods is the kind of place that’s crawling with secrets. Secrets like a mysterious gwishin haunting the grounds, a blood-red scarf wrapped too tightly around her ghostly neck. And a witch-hunting dokkaebi intent on finding and silencing the last Rhee witch. And the strange habit all the counselors have of rhyming when they speak . . . just like Ronnie has begun to do lately.

For a girl who wants everything to stay the same, nothing is scarier than all the changes Camp Foster brings. New friends. New foes. Souls with unfinished business. And, possibly worst of all, revelations that disprove everything Ronnie knew to be true.

Jenna Lee-Yun combines magic, mystery, suspense, and humor into a ghostly action-packed contemporary fantasy.