Mijoo was just a quiet girl who lived in the country all her life with her little sister Yein. Their parents had died when they were younger and they had to live with their aunt and uncle. While in the city, Mark was a Senior in college. He had his own house and his best friend Yugyeom lived with him. Their parents were CEO's of Color's Music. What will be the reason for when Mijoo and Yein move to the city?