This is the Sheet Music PDF of Ru's piano cover “崩壞:星穹鐵道 Honkai: Star Rail Version 2.0 OST - 使一顆心免於悲傷 If I Can Stop One Heart From Breaking”
Here is the YouTube video: https://youtu.be/AK1YagCGzLQ?si=Xto9EDk7tvOTfQG9
Arranged and Performed by RuRu. (鋼琴改編及演奏: RuRu)