There are several piano background music in Mr. Good, such as: opening, warmth, release, beauty, etc. The most common ones are opening and beauty. All the piano soundtracks in it are works by Tan Xuan. You can search for Tan Xuan + Mr. Good TV Series Original Soundtrack in Kugou Music. You can definitely find it, but you have to pay to download it. You can first listen to see if it is what you are looking for. Finding the name of the song is the most difficult thing. I also really like these soundtracks and hope they can help you.