In the heart of a bustling city, two souls live in different worlds that are about to collide. Liu Cheng is a dedicated dance and music student whose world revolves around rhythm and melody. While Zhan Xuan is a brilliant, distant music professor trapped in a cycle of a toxic, flickering romance. When their parents' marriage forces them under the same roof, the friction is immediate. Between the cold walls of a shared apartment and the halls of the university, a forbidden tension begins to grow.

Ten years ago, Liu Xuan Cheng and Zhan Xuan were deeply in love. They met in college; one was studying to be a doctor, and the other was a talented musician. But because of family pressure and a big misunderstanding, they were separated by the people and the world because they are not able to fight. They broke up and one of them was forced to move to a different country. Now, they are adults. They have both married into the same rich family, the Zheng family. Liu Xuan Cheng is a surgeon and is married to the older brother, Zheng Yong Bo (a CEO). While Zhan Xuan is a famous musician and is married to the younger brother, Zheng Fanxing (an artist). Now, these two ex-lovers have to live in the same big house. Will they be able to pretend to be strangers while dealing with their old feelings?