Sheren Tang
Producer Nelson Cheung cast Bobby Au-yeung, Sheren Tang, Moses Chan, and Myolie Wu in the lead roles in November 2010. Cheung planned to cast Sheren Tang in female lead role, but Tang was already booked to film for Mainland Chinese period drama "Qing Cheng Xue" during the same time as "House"'s filming schedule. Cheung then cast Linda Chung to replace Tang's female lead role. Linda Chung is cast in her 1st semi-villain role. To focus on his coffee shop business, Chan withdrew from the production in early April 2011, a month before filming commenced. TVB's Production Department supervisor Tommy Leung then offered Bowie Lam the role, but Lam rejected the offer, stating that he has already accepted to film a Mainland Chinese production. Suggested by Au-yeung, the role was then offered to Mak Cheung-ching, who accepted it two weeks before filming. Before the casting of Mak, Cheung has once considered Pierre Ngo for the role, and even sought for the script to be rewritten to accommodate Ngo.