The Life of a Piano Genius is a Manga/Manhwa/Manhua in english language, Manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Only in death did I realize the meaning of my life. Daehwa Kim is a piano prodigy who drops out of a prestigious performing arts high school due to a lack of passion. Just when he finally discovers his love for the piano at 30, he gets into a fatal accident, only to wake up as a high school student again! Can he turn his fate around this time?