To fuel the buzz ahead of last night's general release of Overheard 2, the much-anticipated sequel to the 2009 hit thriller, its producers held a special ceremony and charity screening of the film at The One in Tsim Sha Tsui. Executives from event sponsor Audi - whose latest S5 Coupe features in several of the film's car chases - officiated at a ceremony on Tuesday to donate HK$290,000 to children's charity Unicef on behalf of the film. Overheard 2 directors Alan Mak Siu-fai and Felix Chong Man-keung, producer Derek Yee Tung-sing and almost the entire leading cast turned up to take part in the cheque-giving ceremony; headlining star Louis Koo Tin-lok was conspicuously missing because of a leg injury. A show of charitable generosity the event may have been, but Mak and the cast were careful not to offer any spoilers to the film ahead of the screening. When asked about his character, the dashing Daniel Wu Yin-cho said only that he was the 'heckler' of the film. Mainland actress Huang Yi kept mum about her bedroom scene with co-star Sean Lau Ching-wan, while Michelle Ye Xuan joked about a scene that didn't make it into the final edit, where she shed bitter tears. 'My character's feelings at that point were that [Koo's character] had become too old and fat, and she felt it was time to ditch him,' Ye said. At which point fellow cast member Dion Lam Dik-on quickly shot back: 'As Koo's 'unofficial rep' here tonight, I'll be sure that he hears about this.'