Big Brother (2018)

A high school teacher, Henry Chen as known as Big Brother with rather rusty writing skills yet armed with the most knowledgeable fists and heart of steel, comes to enlighten and inspire the students with his unconventional teaching methods in a school where the students are under-performing and preoccupied with non-academic activities. An opportunistic entrepreneur creates havoc by sending in a motley gang of fighters to win over the land just when the students are improving their work and enjoying the merits of the educational system due to which Chen is forced to use his defending skills to rescue one of his kidnapped students when he is caught up by his dark past in the underworld.