Kelly Chen as Dr. Lee Sum-yee (李心兒; Lee Sum Yi), Chan's therapist and love interest.
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Andy Lau, Tony Leung, Kelly Chen, Anthony Wong, Eric Tsang, and Chapman To reprise their roles again, joined by new cast members Leon Lai and Chen Daoming.
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Before the picture fades into the next scene, the camera pans down onto Lau's fingers tapping out in Morse code, "H-E-L..." (and then the start of another 'L' as the picture dims).
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