Shin Chanseul was a young fashion designer in Seoul. Her father & brother was missing while her mother ran away somewhere. She lived alone with her cute cat, Leon. She studied at Seoul Arts High School, she had a crush named Oh Sehun, and a rival named Cha Jaein. She lived her life perfectly until something happened, her foods were gone, and her house was a big mess. She was shocked when she found a boy, sleeping on her brother's bed. The boy lost his memories when he got to a car accident. Chanseul had to take care of him because she feels so pity to him. Bit by bit, the boy started to remember little things. He was Kim Myungsoo and he can talk a small sentence. Since Chanseul was to preoccupied with Myungsoo, she forgot about Sehun. This made Sehun sad because he likes Chanseul. The same goes for Jaein, Chanseul's rival. She got very interested to Myungsoo when he picked up Chanseul. She tried to be cute as possible so that Myungsoo will look at her. But all of her efforts failed. Later on, Sehun and Jaein planned something to get what they want.

How will these young teenagers live their life?