In this world, there are nine cities that are famous for their own characteristics, namely: the city of literature in city K, the city of music in city O, the city of food in city D, the city of art in city A, the city of dance in city T, the astronomy city in city W, the romantic city in city V, the historical city in city L, and the city of philosophy in city B.
Zhan Zhan grew up in K city with a smile. She was raised by her mother in a single family. She loves music very much and has dreamed of going to O City, a music city, to learn piano since she was a child. However, she was unable to obtain a full university scholarship in City O, so she could only stay in City K to study literature, and started working as a little assistant with the writer Jin Lingfei.
Lan Yu, Zhan Xiaoyan's crush since childhood, is devoted to art.
Showing his love for Lan Yu with a smile has become a habit. When she saw her childhood friends Jin Duola and Lan Yu walking together, she felt sad.
Why did Lan Yu, who majored in art, switch to music and become a couple with Jin Duola?
Zhan Xiaoyan met Lan Yu's cousin Lan He on the road of writing. Lan He, who owned a publishing house, strongly pursued Zhan Xiaoyan.
Facing Lan He's pursuit, Zhan Xiaoyan seemed to be shaken. But is the love for Lan Yu that has become a habit really so easy to take back?