Under Current is an upcoming Hong Kong action thriller film directed by Alan Mak and starring Aaron Kwok, Simon Yam and Francis Ng.

Kwok stars as a barrister who collaborates with a police officer (Ng) to investigate the mysterious death of a financial director (Yam) of a charity organisation.

[1] The film was first announced in March 2022 at the Hong Kong International Film & TV Market (FILMART) in March under the title Insider, with Alan Mak set to direct and to star Aaron Kwok, Simon Yam, Raymond Lam, Alex Fong, Kathy Yuen, Niki Chow and Gladys Li, with production slated to begin in May of the same year after it was postponed from February amid the fifth wave of the COVID-19 pandemic in Hong Kong.

Mak originally had William Chan in mind to replace Lam, but instead opt for Ng as the character was a middle-aged man with much life experience.

[4] Principal photography for the film, which is now titled Under Current, began on 6 June 2022, where a production commencement ceremony was held attended by the cast and crew, hosted by Emperor Group chairman Albert Yeung.