"Delighted Smile" was written and composed by renowned musician Little Bug (Chen Huanchang). The song was originally sung by Taiwanese singer Lee Li-Fen in 1993 and included in her solo album "Discovery", and was well loved for its bold, atmospheric and open-minded lyrics and melody.
As the ending song of the TV series "Heroic Boys", "Delighted Smile" quickly became popular, and its lyrics conveyed a kind of human attitude of seeing through life's gains and losses, and being indifferent to fame and fortune, such as "Life is originally a play, why should I care too much about enmity and grudges; Fame and fortune, what is it? The chorus of the song is "I'm smiling proudly, I'm smiling proudly, I'm happy to be free".