Missed the ending....

Ling tells Ching the boy that was on the swings with her was the guy who was stealing kidneys and they were in on it together. She then drugs Ching, kills Wai, then gets Ching in a tub of ice after Ching goes after Ling with an ax. Ching wakes up in a hospital where the docs tell her shes okay because they found a kidney at the scene. Come to find out Ling cut her own kidney out and died at the scene so they would put her kidney in Ching. Ching goes nuts and starts screaming for them to take it out. Cut to the scene where Ling tells Ching they'll always be together...and it turns out they always will cause of the KIDNEY SPPOOOKKKYY.

Okay Im not the best movie explainer so I hope you get it...