According to Baidu Encyclopedia, the original song "Persistence of Life" is the melody in my heart. This song was released on August 4th, 20 1 1, and included in the album of the same name "Persistence in Life".
Lyrics of persistent life: You are the only poem in my heart. I will heartily song for you and offer my sincere love. You are my heart, my only desire. I will follow you closely all my life and let you take me to heaven.