C124 Li Wan's Plan
The melody of that song is very familiar, it's the mark of rain.
The person who played this song was Shi Jingchen. Because his style of playing was different from others, Shi Xiaoxi could easily distinguish it.
Walking along the source of the sound, Shi Xiaoxi saw Shi Jingchen and Lyi Wan outside the door.
They sat together in front of the piano