A Sheng was a Taiwan businessman based in Beijing. He had two marriages. His divorced ex-wife lived in Taiwan, and he was living happily with his current wife in Beijing. He also had two daughters named Jiaxin and Lianlian. The younger
sister, Lianlian, admires the elder sister Jiaxin and moves from Beijing to Taiwan for college. Lianlian dies suddenly during a scubadiving activity with her swimming team. The police determine that she suffocated to death from overdosing on
sleep pills. They list the roommate and elder sister Jiaxin as the suspect, because she was an experience diver. A Sheng returns to Taiwan to host the funeral, and Lianlian’s mom also comes to Taiwan to find the truth. The ex-wife, Jiaxin’s mother, tries her best to protect Jiaxin. But the swimming team leader Bo Yan seems to know something.