A man with plans to propose to his girlfriend hides an engagement ring in the ancient underwater ruins off Japan's Yonaguni Island. When he goes missing she must investigate and remember what happened.

• Mandarin Film
• China Film Group Corporation
• Angelica Lee Sin-Jie
• Isabella Leong
• Chang Chen
• Guo Xiaodong
• Tony Leung Ka-Fai
• Ayal Komod
• Lee Luk-Yu
• Julie Yip