Fourth-grader Ben Lee is anxious to make new friends at his new school in Michigan. But on his first day, things take a turn for the worse. The other kids act grossed out by the homemade kimbap in his lunch box. Embarrassed, Ben makes an impulsive wish, and soon strange things start happening. A ham sandwich appears in his lunch box inside instead of Mom's homemade mandoo. At first, Ben is thrilled. But soon the magical switcheroos start happening regularly and to other things—like Ben's favorite Korean cartoon, Tobot V. And the special pencils his grandma sent from Korea. How far will the lunchbox magic go? And how far will Ben go to set things right?

Ben is thrilled when his mom signs him up for taekwondo—especially when his best friend, Emilio, signs up too. During their first class, it becomes clear that Emilio is a natural. Ben, meanwhile, struggles to keep up. He is frustrated and embarrassed . . . until he runs into Mr. Wiz, the mysterious janitor from his school, at the studio. Mr. Wiz gives Ben a black belt, and suddenly Ben's skills start to progress. What's behind the sudden improvement? And will the black belt help Ben come out on top when he and Emilio face off? Or will it cost him his best friend?