"Proud Smile" is a popular song composed by Boog and sung by Li Lifen. This song is the ending song of the Taiwanese drama Hero Boy 1993, and later became the ending song of the mainland TV series Command Four Treasures in 2004, which was sung by male singer Li Tianhua. The release time of the fake smile is 1993. The classic fragment of the song is: things are unpredictable, there is no chance of reunion in this life, love and hate.