He obsessively investigates a mysterious new rival, (Leon Lai), whom he suspects is another mole.
Ming tracks down a retired police psychiatrist, Dr. Kwan, who treated Lau in secret. Dr. Kwan warns him: “You’re not investigating a case. You’re stepping into a hall of mirrors. Lau Kin-Ming suffered from a condition I call Infernal Recursion . He could no longer distinguish his own memories from the mole he was hunting. He began to become Chan Wing-Yan.” Infernal Affairs III
The genius of Andy Lau’s performance is that he plays Ming as a hollow shell. Every smile is a twitch. Every handshake is a calculation. Ming tries to be normal. He buys his girlfriend a stereo. He eats his meals on time. But the suppressed guilt of being responsible for Chan’s death—the man he was meant to mirror—consumes him. He obsessively investigates a mysterious new rival, (Leon