On the first day of kindergarten, a teacher asks the boys and girls to line up, and Yoon lines up with the other girls. But when some children mistake Yoon for a boy because of her short hair, Yoon bursts into tears. Does she really look like a boy? At home, Yoon finds a solution. Her sister's special headband is perfect! When she wears it to kindergarten, no one teases or mistakes her for anything but who she is! Yoon has a lovely time with her new friends. But Yoon's sister has been missing her special headband so when Yoon has to go back to school without it, she's worried all over again. Thankfully, her friends like Yoon exactly the way she is.