本片讲述一个过气的歌手想成为巨星的故事。由以演唱音乐视频"Unbelievable"翻红 的陈天文担任电影男主角，这也是他首次挑大梁。以80年代的新加坡为背景，讲述小人物Eric Kwek在面临生活重重挑战，依旧坚持自己的理想，试图将英文歌词和曲风融入福建歌里，最后取得成功。

Mr Unbelievable tells the story of Eric Kwek Hock Seng, who takes it upon himself to the symbol of national pride. As his Shifu’s Getai business declines in popularity, Eric wants to spark new ideas by adding English lyrics into Chinese songs albeit to strong objection from his Shifu & friends. Undeterred, Eric Kwek sets on an unbelievable musical journey that sees him through mostly lows and finally hits a high when he is at the ripe old age of 50. The film aims to highlight that one must believe and persist in his aspirations regardless of age!