Mr. Unbelievable (Chinese: Unbelievable先生; pinyin: Unbelievable xiānshēng) is a 2015 Singaporean musical comedy film directed by Ong Kuo Sin, and starring Chen Tianwen as the titular protagonist. It is based on the viral song "Unbelievable" and was released in cinemas in Singapore on December 3, 2015, and in Malaysia on January 14, 2016. It also marks the third on-screen reunion of Chen Tianwen, Liu Lingling, Roy Li and Hayley Woo after their previous collaborations in the Singaporean long drama series 118 and 118 II, where both of the installments theme songs were sung by popular local celebrity and film director Jack Neo. Secondly, it also marks another on-screen reunion of Liu Lingling and Zhang Xinxiang after their previous collaboration in the local drama known as Portrait of Home and 118. Thirdly, it also marks another on-screen reunion of Liu Lingling and Jaime Teo after their previous collaboration in I Not Stupid Too TV Series, also directed by Jack Neo. Moreover, it also marks another on-screen reunion of Chen Tianwen, Tosh Zhang and Zhang Xinxiang after their previous collaborations in the Lion Dance movies The Lion Men and The Lion Men: Ultimate Showdown, another movie franchise also directed by Jack Neo once again. Furthermore, it also marks another on-screen reunion of Chen Tianwen and Tosh Zhang after their previous collaborations in the Ah Boys to Men film series either, including Ah Boys to Men, Ah Boys to Men 2 and Ah Boys to Men 3: Frogmen, also directed by Jack Neo either. At the same time, it also marks another on-screen reunion of Chen Tianwen, Tosh Zhang, Hayley Woo and Gadrick Chin after their previous collaboration together in Jack Neo's Naval Diving Unit movie known as Ah Boys to Men 3: Frogmen. Also, Chen Tianwen and Gadrick Chin would later collaborate again as enemies in the movie known as Take 2, which was executive produced by Jack Neo once again either and directed by Ivan Ho.