Koma
One night, Ching is kidnapped by a mysterious man that seems to be an ally of Ling's. Here, Ching reveals that her kidney is weak, and the man will not be able to sell it for much. She passes out, and wakes to find Ling injured beside her. Ching takes her to the hospital, and it isn't long before Ching finds out that Ling is actually a kind person, more true then the friendships Ching shares with her superficial socialite friends. She learns that Ling has a childhood sweetheart, whose identity she does not reveal.
Ching and Ling then make a deal with the mysterious man so that Ching can get a kidney. However Ching informs the police beforehand, and when they arrive, the man holds Ling hostage. However, Ling supposedly kills the man. Wai begins to suspect Ling, and breaks into her house. Meanwhile Ching invites Ling to her house where she learns that the man who was killed was none other than Ling's childhood sweetheart. Ling tells her that since she was in need of money for her mother, she and the man planned to make a living selling kidneys. However, because of Ching's 'betrayal', the man killed himself. Ling then discovers that Wai has been searching her house. She holds Wai hostage and asks Ching to come to her workplace, a research center, and give her kidney. Ching, armed with an axe chases Ling, her anger intensifying when she learns that Wai is dead. But Ling suffocates her with plastic.
In the end, Ching wakes up in hospital, where a doctor tells her that she was in critical condition, but saved by a kidney that belonged to the dead at the scene where she was found. She realizes that Ling hacked herself to death to give her the kidney she always wanted. Unable to digest this information, she starts screaming, begging the doctor to remove her kidney, as the camera cuts to a shot of Ching telling Ling they will always be together, and another of Ling lying dead with her voiceover saying, "You'll owe me this forever." There is a final shot of Ching, under the effect of sedatives, falling unconscious.