In 1978 in a small town in South Korea, a corrupt detective named Cheon is asked by a church minister to arrest an unofficial street preacher, whose influence has been growing, and who has collected large donations. The donors are pressured into saying that they were defrauded, which leads to the preacher's imprisonment and subsequent torture by Cheon in order to extract a confession. To Cheon's surprise, the preacher demonstrates amazing endurance and will-power, leading Cheon to release him and to fund his preaching. Cheon uses their new-found friendship to bolster his own reputation and recruit henchmen. Around this time, a young girl named Lee is raped by three men, and Cheon earns her respect by beating them up.

Around 25 years later, Ryoo, the estranged son of the preacher, is anonymously informed of his father's death and travels to the town, which happens to be the new jurisdiction of his acquaintance Park, a prosecutor. Ryoo encounters an elderly Cheon, whom all the townsfolk seem to venerate and fear. With Cheon are three henchmen, Jeon, Ha, and Kim, and also Lee, who became Cheon's wife.

After the funeral, Ryoo stays behind to investigate, as he suspects his father was murdered, and finds several clues such as suspicious real-estate transactions. At this point, Jeon attempts to murder Ryoo, but Ryoo fights back and kills him. Ha attempts to murder Ryoo, who resists by lighting Ha's house on fire. Lee sees this and rescues Ryoo, and minutes later Ha burns to death, having entered the burning house to rescue his valuables.

As it turns out, Cheon has been serially extorting townspeople for their land, which he re-sells, and he has murdered anyone who didn't cooperate. Owing to his political connections, the police never indict him. Additionally, a mass poisoning occurred at a prayer house during this period, leaving dozens dead, and the culprit was never caught. Park, having spoken with Ryoo, builds a case against Cheon over the opposition of his corrupt superiors, and the last henchman Kim agrees to testify.

Sadly, Cheon eaves-drops on the conversation and has Kim murdered. Ryoo angrily confronts Cheon, who reveals that Ryoo's father, upon realizing the extent of Cheon's corruption, attempted to murder Cheon in his sleep. Lee, fortunately, agrees to testify and to hand over evidence. She explains that years ago she had opposed a tentative plan to dispose of Ryoo's father, and in retaliation, Cheon's three henchmen had raped her.

As the town is raided by police, Ryoo, Park, and Lee confront Cheon at his house. Cheon is outraged that Lee betrayed him, and what is more, they argue over who did the prayer-house massacre. Cheon claims that Ryoo's father did it, while Lee claims that Cheon did it. In the midst of the raid, Cheon's son attempts to burn the evidence, and accidentally kills himself. As the police try to arrest Cheon, he shoots himself in the head, which brings the case to a close, though Ryoo's father's death goes unexplained.

A year later, Ryoo visits his father's grave, and discovers that Lee has become the leader of the town. He suddenly recalls the anonymous phone call, as well as the convenient placement of clues, and realizes, to his horror, that Lee was his father's murderer. Having been tortured by Cheon, and wishing for an escape, Lee poisoned Ryoo's father so that Ryoo would arrive and open an investigation, the one which finally brought about Cheon's defeat.

• Jung Jae-young as Cheon Yong-deok, the village head
• Park Hae-il as Ryoo Hae-kook
• Yoo Jun-sang as Park Min-wook, a public prosecutor
• Yoo Sun as Lee Yeong-ji, a village resident
• Yoo Hae-jin as Kim Deok-cheon, a village head
• Kim Sang-ho as Jeon Seok-man, a village resident
• Kim Joon-bae as Ha Seong-kyoo, a village resident
• Heo Joon-ho as Ryoo Mok-hyeon, Hae-kook's father
• Kang Shin-il as a district prosecutor
• Im Seung-dae as Mr. Cheon, a village police officer
• Jeong Gyoo-soo as a principal
• Lee Cheol-min

Moss was shot in Muju County, North Jeolla Province.^[3][4]

Moss was picked up for distribution in the UK by Inclusionism Films. The DVD release featured extensive interviews with both the film's director and comic artist Yoon Tae-ho.

From a contemporary review for The Korea Times, Lee Hyo-won stated, "In spite of some details that go amiss as Kang tries to pack in too much, the long running time of two-and-a-half hours goes by in no time _ which says a lot about the high quality of the suspense this film aims to offer. But it also inspires a lot of laughter through some ingenious comic relief in between the thrills."^[5]

Moss received mixed retrospective reviews, praising the cinematography and acting, but criticising its length and relative predictability.^[6][7][8]

Moss was screened in New York in 2015 as part of the Korean Movie Night.^[9]

• Official website (in Korean)
• Moss at Naver (in Korean)
• Moss at HanCinema
• Moss at the Korean Movie Database
• Moss at IMDb