The theme song for Life on the Line is "Fearless Shoulder" (無畏的肩膊), by Fred Cheng.
Hana Kuk performs two songs for the series. The first one is the ending theme song, "Never Spoken About" (從未說起).
The second song is the sub-theme song - a rendition of "但願人長久" (Wishing We Last Forever), originally by Lowell Lo. Leslie Cheung also recorded a version of the song.