* BigLippedAlligatorMoment: The man who appears to have cerebral palsy and hangs out around the river bank. It's never really addressed who the heck he is or why he's there.
* JerkassWoobie: The three main charcters: Dong-jin, Ryu and Yeong-mi. Apparently, their misery is all because of their own actions, which is what started the CycleOfRevenge in the first place.
* MoralEventHorizon: [[spoiler:The main character, Dong-jin himself]] crosses this when he [[spoiler:tortures Yeong-mi to death, thereby showing that he's really no better than the kidnappers]]. And if that wasn't enough, it's also revealed that he [[spoiler:also killed the delivery boy who delivered the noodles to Yeong-mi's house, because said guy may or may not be a witness to Dong-jin's crime]].
** In addition to the autopsies, there's a couple close ups of slash wounds, and they are ''not'' pretty.
** Ryu's next door neighbors masturbating to what they assume are orgasm moans. When the camera pans over to Ryu's apartment, it's really moans of agony of his sister rolling in pain.
** Ryu's deal with the black market organ dealers. What was he expecting?
** One wonders why they left him alive after stealing his money and an organ. What were they expecting?
** [[spoiler: Why would you leave pictures of the girl you kidnapped lying around your apartment in plain view?]]