Hidden in a bustling city, a noodle shop serves as a hub for a mysterious assassin organisation. No.4, orphaned and raised in the shop, accepts a seemingly straightforward mission in Japan, where he falls into a trap set by his mysterious client. As she attempts to recruit him for her vendetta, their actions lead to both being hunted by the yakuza. Starring rising star Jeffrey Ngai in his first leading role, alongside Japanese newcomer Sara Minami and veteran Naoto Takenaka, with Chu Pak Him and Rosa Maria Velasco, this Hong Kong-Japan coproduction delivers a composed and enthralling calling card from a cast who together make an unstoppable team.