Fredric Mao Chun-fai was excited when he announced the fifth run of The Liaisons, the stage drama directed by Mao and co-written by Infernal Affairs screenwriter-director duo Felix Chong Man-keung and Alan Mak Siu-fai. And he had every reason to be so happy. Having premiered at last year's Hong Kong Arts Festival, when all seven shows were sold out, The Liaisons was then staged in Beijing, Shanghai and Shenzhen, bringing accolades and an award. 'This drama is special as it's been done in a new form. It incorporates opera and traditional theatre with modern musical theatre,' Mao said on Wednesday. The Liaisons is an experimental remake of playwright Tong Tik-sang's Cantonese opera The Legend of the Purple Hairpin. 'We've spent a lot of time and effort blending different elements together - the opera enhances our main, modern story well.' Mao was joined at a briefing by cast members including Amy Wu Mei-yee, Louis Cheung Kai-chung and Josie Ho Chiu-yee. Ho said it was a dream come true working with Mao. Her husband, Conroy Chan Chi-chung, was also working hard. 'He's lost almost 70 pounds [32kg]. Although I love him whether he's fat or thin, his health is going downhill,' Ho said.