: While Yoo-gun appears to join Ik-ho's syndicate to survive, it is eventually revealed that he is on a dangerous undercover mission to expose the organization and uncover the truth behind his brother's death. Themes and Atmosphere

: Yoo-gun initially struggles as he is surrounded by criminals he personally put behind bars. However, his fearless nature catches the attention of Ik-ho.

: The cinematography was highly regarded, particularly the visually striking climax featuring a burning prison building. The Prison (2017) - IMDb

The film is noted for its and oppressive atmosphere . It delves into several complex themes:

: The prison is depicted not as a place of reform, but as a hub for flawless criminal operations where the system itself is the primary enabler of crime.