A coffee shop owner, Il-woo and Nail artist, Anna are in a happy romantic relationship. They keep their relationship in a secret because of their age difference. Also, there is Sora, who has a crush on Il-woo gets jealous of Anna, she tries to tear them apart. One day, Anna's grandmother gives Anna a magic card. The card is to make her wish come true. After that day, she turns into a 10 years old girl, Hannah. Anna's wish "to become young"come true!