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 anyt…