Dark Hole

Dark Hole (Korean: 다크홀; RR: Dakeuhol) is a South Korean television series starring Kim Ok-vin and Lee Joon-hyuk.^[1] The fifth series of OCN's "Dramatic Cinema" project which combines film and drama formats, premiered on OCN TV on April 30, 2021.^[2][3][4]

Dark Hole
Promotional poster
Hangul	다크홀
Genre	Thriller Mystery Fantasy
Created by	OCN
Written by	Jung Yi-do
Directed by	Kim Bong-joo
Starring	Kim Ok-vin Lee Joon-hyuk
Composer	Jeung Seung Hyun
Country of origin	South Korea
Original language	Korean
No. of episodes	12
Production
Executive producers	Han Ji Haing Lee Jeong-soon
Producers	Park Se Yeon Kim Awol In Ahn ho Ryum Lee Min Jin Kim Da Hine
Running time	60 minutes
Production companies	Kiwi Media Group WooSang Film
Original release
Network	OCN tvN
Release	April 30 (2021-04-30) – June 5, 2021 (2021-06-05)

Synopsis

Dark Hole is about a detective and a wrecker driver who have to fight for their lives against mutants that are created when humans breathe mysterious dark smoke from a sinkhole.

Cast

Main

• Kim Ok-vin as Lee Hwa-sun,^[5] a detective grieving over the death of her husband
• Lee Joon-hyuk as Yoo Tae-han, a former detective turned wrecker driver

Supporting

• Park Keun-rok as Choi Seung-tae
• Yoon Jung-hoon as Woo-sang
• Jang Sung-won as Lee Young-tae
• Kim Do-hoon as Lee Jin-seok
• Im Won-hee as Park Soon-il
• Zo Zee-An as Cho Hyun-ho
• Jeon Young-mi^[6]
• Kim Do-hoon as Lee Jin-seok
• Cho Ja-In as Cho Hyun-Ho
• Bae Jung-hwa
• Oh Yu-jin as Han Dong-rim
• Kim Byung-ki as Choi Kyeong-soo
• Kim Han-jong as Nam Yeong-sik
• Kim Byung-ki as Choi Kyung Soo
• Bae Jung-hwa as Han Ji-soo
• Kim Su-ol as Yoon Ji-Ae
• Lee Ha-eun^[7] as Yoon Saet-byeol
• Song Sang-eun as Kim Seon-nyeo
• Kim Kang-min as Min-gyu

Special appearances

• Tak Jae-hoon as Restaurant Owner
• Ahn Eun-jin as So Jung-hwa
• Kim Han Jong as Nam Young Sik
• Jung Hae-kyun as Lim Joo-ho
• Won Choon gyu as Nam Jin-Il
• Heo Hyeong-gyu as Kang Sung-Bum
• Choi Jung-kyu as Yoo Kang-soo
• Chung Su-bin^[8]

Production

OCN announced its lineup of 2021 drama slate in November 2020 which included the fifth installment of the 'Dramatic Cinema' project, Dark Hole.^[9][10]

Casting

OCN revealed the casting news of Kim Ok-vin and Lee Joon-hyuk on October 9, 2020.^[11] On December 11, 2020, Yoon Jung-hoon was confirmed to join the cast^[12] and on December 14, 2020, Jang Sung-won reportedly joined the cast.^[13] The photos from the first script reading were released by OCN on March 2, 2021.^[14]

Viewership

Season		Episode number												Average
		1	2	3	4	5	6	7	8	9	10	11	12
	1	427	572	309	410	N/A	N/A	N/A	N/A	N/A	N/A	N/A	297	N/A

Dark Hole : South Korea viewers per episode (thousands)

Source: Audience measurement performed nationwide by Nielsen Korea (tvN ratings)^[15]

Average TV viewership ratings

Ep.	Original broadcast date	Average audience share (Nielsen Korea)[15]
		OCN	tvN
		Nationwide	Nationwide	Seoul
1	April 30, 2021	1.025% (NR)	1.882% (3rd)	2.370% (3rd)
2	May 1, 2021	0.957% (NR)	2.352% (3rd)	2.873% (3rd)
3	May 7, 2021	0.8% (NR)	1.070% (NR)	—
4	May 8, 2021	0.8% (NR)	1.647% (8th)	1.769% (10th)
5	May 14, 2021	0.7% (NR)	0.940% (20th)	1.166% (9th)
6	May 15, 2021	0.8% (NR)	0.9% (NR)	—
7	May 21, 2021	0.6% (NR)	0.9% (NR)	—
8	May 22, 2021	0.6% (NR)	1.1% (NR)	—
9	May 28, 2021	0.5% (NR)	0.98% (20th)	1.137% (9th)
10	May 29, 2021	0.5% (NR)	1.0% (NR)	—
11	June 4, 2021	0.5% (NR)	0.7% (NR)	—
12	June 5, 2021	1.0% (NR)	1.42% (11th)	1.915% (5th)
In the table above, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings. This drama airs on a cable channel/pay TV which normally has a relatively smaller audience compared to free-to-air TV/public broadcasters (KBS, SBS, MBC and EBS). NR denotes that the series did not rank in the top 10 daily programs on that date. N/A denotes that the rating is not known.