"step on your heart" was uploaded onto Niconico on June 6, 2012 and is one of Luo Tianyi's first demo songs.
The song is vague and open for interpretation, but is mainly about love and following dreams.
This melody has two other versions: the Japanese version and a full version which is on Luna Safari's second album, 「Miles;Smile」.
It was used in VOCALOID CHINA's promotional videos. The instrumental versions of the song were used in episodes 1 and 3. The introduction section was played towards the end of the first episode. In episode 5, the introduction was only instrumental, but the rest of the song had Tianyi singing.