Song - Source
Shang - Jacqueline Dupree (cello)
The Mountain of Miracles - Masaaki Kishibe
Tegami - Nishimura Yukie
A drama of joys and sorrows (the tragic song of Asking Heaven for Punishment)
Molde Canticle - Sissel Sissel (This song is hummed, and I also like it)
Daisy - Guzheng
If Love Has Providence (Highly praised, also hummed)
Snow Reflects Moving City - Piano (not sad, but very nice)
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You can also search "Night's Piano Music" on your own, written by Shi Jin. The melody is soft and soothing, and always gives people a faint feeling of sadness. Everything sounds great. ("Night's Piano Five" was also used as the background music at the end of the movie "If You Are the One 2", which is the background music when the little girl reads a poem to her father who is about to leave)