Episode 1
Episode 1
1h8.0 / 10
Mu-yeom who became a detective for his father, receives news like a nightmare.
Where to watch Gap Dong
TV series
Gap Dong
2014NR1 season6.4 / 10
20 years ago Moo-Yeom’s father was a suspect in the "Gap Dong” serial murder case. Because of the detectives’ oppressive investigation, Moo-Yeom’s father killed himself. Now, Moo-Yeom is a detective and works to capture the killer Gap Dong. The statue of limitations has expired for the serial murder case and Moo-Yeom resigns to the belief that Gap Dong is dead. New clues though for Gap Dong appears in front of Moo-Yeom and he sets out to catch him once and for all.
Streaming, rental and purchase options
Where to watch in United States
Checked Sep 3, 2026
Gap Dong is available to stream on The Roku Channel and OnDemandKorea in United States. Use the direct links below to open the provider.
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Synopsis
20 years ago Moo-Yeom’s father was a suspect in the "Gap Dong” serial murder case. Because of the detectives’ oppressive investigation, Moo-Yeom’s father killed himself. Now, Moo-Yeom is a detective and works to capture the killer Gap Dong. The statue of limitations has expired for the serial murder case and Moo-Yeom resigns to the belief that Gap Dong is dead. New clues though for Gap Dong appears in front of Moo-Yeom and he sets out to catch him once and for all.
Season 1 episodes
Choose an episode, then use the watch options above for the show.
Episode 2
Episode 2
1h
Hearing something suspicious about the body of a murder case, Mu-yeom rushes to the crime scene.
Where to watch Gap Dong
Episode 3
Episode 3
1h
It's reported that the first case is the act of Gabdong and there will be a second case of murder.
Where to watch Gap Dong
Episode 4
Episode 4
1h
Mu-yeom is arrested as a criminal, and Yang suggests to compare the DNA of Gabdong and Mu-yeom.
Where to watch Gap Dong
Episode 5
Episode 5
1h
Chief Yang meets Maria and thinks of a girl he met at the scene for a case from a while ago.
Where to watch Gap Dong
Episode 6
Episode 6
1h
Mu-yeom suspects Tae-oh as Gabdong. Tae-oh lets out the story of his dead father to Maria.
Where to watch Gap Dong
Episode 7
Episode 7
1h
The civilians blast anger and attack the police for failing at preventing the fourth case.
Where to watch Gap Dong
Episode 8
Episode 8
1h
Mu-yeom kidnaps Ji-ul and tracks down Tae-oh, with the predicted date for a fifth case approaching.
Where to watch Gap Dong
Episode 9
Episode 9
1h
After finding a corpse, Mu-yeom runs at Tae-oh, and Maria witnesses something shocking.
Where to watch Gap Dong
Episode 10
Episode 10
1h
A phone call rings from the real Gabdong. Mu-yeom finally gets to know the true identity of Gabdong.
Where to watch Gap Dong
Episode 11
Episode 11
1h
Gabdong is finally caught. Mu-yeom starts the interrogation and goes to get his shut mouth talking.
Where to watch Gap Dong
Episode 12
Episode 12
1h
The plane the murder happened at, which Tae-oh was in, makes a flyback.
Where to watch Gap Dong
Episode 13
Episode 13
1h
Tae-oh confesses his crimes, and Maria is shocked after finding out that Gabdong's probably dead.
Where to watch Gap Dong
Episode 14
Episode 14
1h
After finishing the montage, Maria turns the young Gabdong montage into Gabdong of the present.
Where to watch Gap Dong
Episode 15
Episode 15
1h
Mu-yeom and Tae-oh, neither one of them slows down and races to the end of the cliff.
Where to watch Gap Dong
Episode 16
Episode 16
1h
Mu-yeom interrogates to prove Do-hyeok as Gabdong. He gets closer to the secret of the Murder case.
Where to watch Gap Dong
Episode 17
Episode 17
1h
While searching Do-hyeok's house, Mu-yeom finds a suspicious picture frame of the Eiffel Tower.
Where to watch Gap Dong
Episode 18
Episode 18
1h
Tae-oh starts a deal between Do-hyeok and Maria. Mu-yeom notices and makes the two Gabdong gather.
Where to watch Gap Dong
Episode 19
Episode 19
1h
A gunshot rings at the pool Mu-yeom and Do-hyeok are at, and someone falls bleeding.
Where to watch Gap Dong
Episode 20
Episode 20
1hfinale
The trial of the two Gabdong finishes, with hard choices to make, the two fall into a great dilemma.
Where to watch Gap DongEpisode information updated Sep 3, 2026
More about Gap Dong
Cast
Jung In-giCha Do-hyeok
Jo Min-junLee Hyung-nyeon
Yoon Sang-hyunHa Moo Yum
Kim Min-joungMaria Oh
Sung Dong-ilYang Cheol-gon
Lee JoonRyu Tae-oh
Kim Ji-wonMa Ji-wool
Kang Nam-gilHan Sang-hoonCredits
- Written by
- Kwon Eum-mi
Production details
- Status
- Ended
- Series type
- Scripted
- Episodes
- 20
- Original language
- Korean
- Original title
- 갑동이
Networks & production
tvNSouth Korea
Pan EntertainmentSouth Korea
Themes
detectiveinvestigationmad dogmurderpsychopathserial killer
