Anti-Climax Boss: Subverted - Lennox's death happens so suddenly at the end of the game that it looks practically like an offscreen death. This is deliberate, because Lennox isn't really dead - the whole game was just a cover so that the US could go after the real Lennox in secret, using the events of the game as cover.
Narm: The in-mission dialogue is filled with dead serious, curse-laden military talk only barely related to the situation going on. It's so at odds with the over-the-top Hollywood gunplay that it comes off as more hilarious than hardcore, and might cause one to think it's a Stealth Parody because of how nonsensical it can get.
Play the Game, Skip the Story: For a good number of players, the level intro cutscenes are nothing but an un-skippable annoyance at first, and a skippable annoyance in later runs. These cutscenes are the part of the game that contains the thickest part of the plot, the levels contain only barely-relatable "commando chatter" between the characters as the player moves on to mow down mooks by the dozen to Visual Effects of Awesome, and can be ignored to no detriment.
Rated M for Money: Zig zagged - the violence in the game is as intense as that of any other FPS, there's a considerable amount of swearing, the protagonist is shown committing an act of torture and constantly smoking, but, bizarrely, there's no blood or gore in the game.
That One Level: The last room of the last level. Holy shit. It can feel like enemies never stop respawning, taking upwards of fifteen minutes to clear out entirely, and they steadily increase in difficulty as they keep coming in. To put this in perspective, the last portion requires you to face off against two machine gun nests and multiple mooks with RPGs. Couple this with a room where the best cover comes in the form of blatant Monster Closets, and you're in for a world of pain.
Wang Yong-choon is a former hitman and sadistic Serial Killer who killed his wife for insurance money. Roped into the far-reaching conspiracy with the promise of a lofty payout, Wang killed many people for the conspiracy and murdered the father of Detective Ha-ram when he saved a child from Wang. After escaping a mental hospital, Wang begins taking revenge, torturing the hospital director to death and killing whoever else catches his fancy, even trying to revenge himself on Congressman Kim by locking him in a burning building with children, not caring if they all burn.
Congressman Kim Woo-shik is one of the masterminds of the conspiracy. Involved in a prostitution ring, Kim raped a teenage girl on camera, unaware he was being filmed. Having numerous people murdered to recover the tape and hide his crime, Kim personally murdered his blackmailer's boyfriend to keep the secret and in the present continues his crimes by eliminating even people close to him if they pose a danger in order to keep his political career alive.