To put it simply, it is a story about Shen Jinnian, who is excellent at writing lyrics and music, and Zong Yan, who can express the original taste of his own singing. He fell in love with her when he heard it and fell in love with her again, but she couldn't get what she wanted.
Also, the ending must be HE
CP: Coldhearted and scumbag in the past, loyal dog in the back (Zong Yan)