Task: Question Answering
Input (English): Context : Infernal Affairs was followed by Infernal Affairs II and Infernal Affairs III. Pre-release publicity focused on its star-studded cast (Andy Lau, Tony Leung, Anthony Wong, Eric Tsang, Kelly Chen and Sammi Cheng), but it later received critical acclaim for its original plot and its concise and swift storytelling style. 
Question : Who has acted in the comedy film Infernal Affairs?
Output (English): Andy Lau