Lin Yun as Mermaid Shan

Deng Chao as Liu Xuan

Zhang Yuqi as Ruolan

Show Lo as Brother Eight

Tsui Hark as Uncle Rich

Wen Zhang as Constable Mo

Kris Wu as Long Jianfei

Lee Sheung-Ching as Constable Shi

Lu Zhengyu as Mr. Liao

Chiu Chi-Ling as Mermaid Long

Zhang Mei'e as Mermaid

Gao Shuang as Liu Xuan's Bodyguard

Linah Matsuoka as George's Assistant

Barbie Liu as Mermaid

Xu Zhenzhen as George's Assistant

White-K as Museum Visitor

Kong Lianshun as Museum Visitor

Tenky Tin Kai-Man as Museum Visitor

Wilson Chin Kwok-Wai as Mermaid Fat

Lam Tze-Chung as Technician

Zheng Jifeng as Cheng

Shuzhen Fan as Mermaid Shitai

Ivan Kotik as Dr. George

Pierre Bourdaud as Auctioneer

Yang Neng as Curator

Sun Jialing as Courier

Li Ye-Qing as Ruo-Lan's Assistant

Kabby Hui as Reporter

Zeng Yilian as Office Lady

Zhou Shuai as Party Guest

Zhao Fanghua as Party Guest

Zhang Aiqin as Bald Merman

Bobby Yip Kin-Sang as (Voice)

Ning Xiaohua as "Chicken King" [BBQ chicken stall boss]

Zhang Zhi Han as Gunner