Question: What member of Cantopop group Twins makes a special appearance in the film Love on the Rocks?

full_context: Document 1: Louis Koo: Louis Koo (Koo Tin-lok 古天樂; born 21 October 1970) is a Hong Kong film actor. He began his professional career as an actor in local television series, winning TVB's Best Actor award in 1999 and 2001. Then he focused on film career. Now Koo is one of the stalwarts of the Hong Kong film industry. Koo has been the ambassador of Hong Kong International Film Festival from 2014 to 2017. Koo founded "One Cool Film Production Limited" in 2013. As of 2017, One Cool Film has produced 14 films.
Document 2: Mimi Chu: Mimi Chu (, born Choo Yit Mei ) is a Malaysian-born Hong Kong actress and singer. She lived in Singapore before moving to Hong Kong. She has appeared at many events. As an actress, she is a recognised face in Hong Kong and Southeast Asia having appeared in both Hong Kong and Singaporean productions.
Document 3: Sammi Cheng: Sammi Cheng Sau-man (; born 19 August 1972) is a Hong Kong singer and actress. She is one of the most prominent female singers in Hong Kong, with album sales of over 30 million copies throughout the Asia-pacific. Most notably in the 1990s, she was dubbed by the media as the "Cantopop Queen" and diva (Chinese: 天后; literally: "Heavenly Queen"). Having success in over 25 years in entertainment industry, Cheng has also been regarded as one of the most popular Hong Kong artists known in Asia Pacific.
Document 4: Throw Down (film): Throw Down () is a 2004 Hong Kong martial arts film directed by Johnnie To and starring Louis Koo, Aaron Kwok, Cherrie Ying and Tony Leung Ka-fai. Director To dedicated the film, one of his most personal films to date, to the late Japanese filmmaker Akira Kurosawa and drew elements from Kurosawa's debut feature "Sanshiro Sugata". The film premiered at the 61st Venice International Film Festival.
Document 5: Marriage on the Rocks: Marriage on the Rocks is a 1965 comedy film starring Frank Sinatra, Deborah Kerr, and Dean Martin about a businessman's wife who ends up divorced by mistake and then married to his best friend by an even bigger mistake. The film was written by Cy Howard and directed by Jack Donohue.
Document 6: Cecilia Cheung: Cecilia Cheung Pak-Chi (born 24 May 1980) is an award-winning Hong Kong actress and cantopop singer. Currently one of Hong Kong's top actresses, Cheung is considered a "Sing girl"—an actress who first received media attention through starring alongside Stephen Chow, and later went on to her own successful career.
Document 7: Charlene Choi: Charlene Choi (born 22 November 1982) is a Canadian-Hong Kong actress and singer. She is a member of Cantopop group Twins, along with Gillian Chung.
Document 8: Love on the Rocks (film): Love on the Rocks () is a 2004 Hong Kong romantic comedy film directed by Dante Lam and Chan Hing-ka. The film stars Louis Koo and Gigi Leung, with special appearances by Charlene Choi and Donnie Yen.
Document 9: Poon Choi Ying Chi: Tsui Ting Or (born 1992), known professionally as Poon Choi Ying Chi, is a Hong Kong singer and comedian. She is the director and one of the hosts of the news satire programmes of "TV Most" and is the vocalist of the band "Autumn Cicada". Beside her role in the satire programmes, she has been an opinion leader among the younger generation of Hong Kong people and has impact on the recent emergence of a Hong Kong identity. She is also known for her involvement in pro-democratic activism.
Document 10: The Twins Effect II: The Twins Effect II is a 2004 Hong Kong action fantasy film directed by Corey Yuen and Patrick Leung. The film is a sequel to "The Twins Effect" (2003), but has a completely different story from the first film. It starred Charlene Choi and Gillian Chung of Cantopop duo Twins in the leading roles. Co-stars include Donnie Yen, Daniel Wu, Edison Chen, Wilson Chen, Tony Leung Ka-fai, Qu Ying, Fan Bingbing and Jim Chim. Jackie Chan also makes a cameo appearance, along with his son Jaycee Chan who is in his debut. The film's original English working title was Huadu Chronicles: Blade of Rose and its US DVD release title is Blade of Kings.
Document 11: Don't Go Breaking My Heart 2: Don't Go Breaking My Heart 2 is a 2014 Hong Kong-Chinese romantic comedy film directed by Johnnie To. A sequel to the 2011 film "Don't Go Breaking My Heart", it stars returning cast members Louis Koo, Gao Yuanyuan and Daniel Wu alongside new cast members Vic Chou and Miriam Yeung. It was screened at the Special Presentations section at the 2014 Toronto International Film Festival. It was released in China on 11 November and in Hong Kong on 13 November 2014.
Document 12: Rosanne Wong: Rosanne Wong (黃婉君, Wong Yuen-Guan, b. 30 June 1979) is the member of a Hong Kong cantopop music group 2R alongside younger sister Race Wong.
Document 13: The Twins Effect: The Twins Effect, also known as Vampire Effect in the United States, is a 2003 Hong Kong film directed by Dante Lam and Donnie Yen. The film was derived from Cantopop group Twins, starring both members Charlene Choi and Gillian Chung in the leading roles. Co-stars include Edison Chen and Ekin Cheng. Jackie Chan makes a
Document 14: Linda Chung: Linda Chung Ka-yan () (born 9 April 1984) is a Canadian actress and singer. She is currently active in Hong Kong and signed with Television Broadcasts Limited (TVB) after winning the 2004 Miss Chinese International. She has starred in several popular TV series, most notably "Forensic Heroes", "Heart of Greed", "Moonlight Resonance", "A Journey Called Life", "The Gem of Life", "Yes, Sir. Sorry, Sir!", "Legend of the Demigods", "Ghost Writer", "Witness Insecurity", "Brother's Keeper", "All That Is Bitter Is Sweet", and Tiger Cubs II.
Document 15: The Love Winner: The Love Winner（恋爱大赢家）is a romantic movie starred by Jimmy Lin (林志颖), Liu Yi Fei （刘亦菲), Xu Shaoyang（许绍洋)，and Yang Gongru（杨恭如).It tells a story that Wang Han Wen(王汉文） who has been studied in a martial arts school has no intention to take over his farther's company comes to Hong Kong to teach in the Businessmen and Technical College.In that college, he meets a girl Qian Yue Shan（钱月珊），whose father has been in heavy debt and she has to pay the money back for her father. Wang Han Wen'father knows that Qian Yue Shan（钱月珊）has close relationship with his son, so he ask her to persuade his son to go back home.He tells her if she succeeds in getting his son back home, he will help her to pay the debt. She has to take it seriously after starting it as a joke and conducts a series of love compaigns.
ground_truth: Charlene Choi