Yinxi escorts socialite Gina to Australia for an auction, Yinchen tags along. Gina sells her necklace at a high price to Mr and Mrs Yue Feihong. Right before the assignment ends, Yinxi gets into a conflict with Gina. The two sisters plan to meet after the mission, but Yinxi fails to show up; unbeknownst to Yinchen, Yinxi is being pursued by a mysterious killer...

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