Black Cast and Characters

Black is the story of a grim reaper who is forced to track down his fugitive partner. In the process, he uncovers the truth about a series of cold case murders from 20 years ago. Investigating the murders complicates the reaper's primary role of guiding the deceased to their respective afterlife, especially after he falls in love with a mortal woman - which leads him to break supernatural rules against involvement in human affairs.

Song Seung-heon as Han Moo-gang (Detective) / Black (Grim Reaper #444)
A grim reaper who has taken over the body of a detective named Han Moo-gang who was investigating the serial murders surrounding the death of his older brother Kim Joon. Towards the end of the series, the grim reaper is revealed to be the soul of Kim Joon who became a grim-reaper after being murdered by his adopted mother (Moo-Gang's biological mother) after she found out that her son needs a heart transplant immediately, instead of saving Kim Joon's life she harvested his heart for his brother (Moo-Gang). After saving Kang Ha-ram by killing the masterminds behind the serial murders, Black commits suicide so that she can live a long and normal life. The grim reaper was later punished for his disobedience by dissipation but he asked for the maximum penalty that his existence will be erase from everyone who knew him thus, erasing all of the actions he made while he was still living as Kim Joon. In the end, Black reunites with Kang Ha-ram to collect her soul after she had lived a peaceful life, and they are seen walking away hand in hand in the final scene.

Go Ara as Kang Ha-ram
A woman who can foresee death as a dark shadow looming over someone which turns out to be a grim reaper following them to their moment of death. She initially is drawn to the detective Moo-Gang (before his body is possessed) since he tries to help her prevent death using her premonition skills, but later stays with Black in Moo-Gang's body because she initially mistakes Moo-Gang for his brother Joon (eventually falling in love with Black, who really is Joon). She also unknowingly keeps a video tape revealing one of the masterminds behind the crimes and serial murders of the series. Her insecurities surrounding her supernatural abilities and broken childhood kept her socially isolated and caused her to easily misled by Black and Soo-Wan, as well as other minor characters.

Lee El as Yoon Soo-wan
A doctor who is in love with Han Moo-gan. She was adopted by Kim Joon's family decades prior to the main storyline, and was the victim of several filmed sexual assaults by the perpetrators of the serial murders.

Kim Dong-jun as Oh Man-soo
A second generation chaebol

Kim Won-hae as Na Gwang-gyun/Crazy Dog

Jung Suk-yong as Bong Man-shik

Lee Chul-min as Oh Soo-tae

Huh Jae-ho as Park Gwi-nam

Ji Su-won as Seo Young-hwa
She is the mother of Han Moo-gang and the adoptive mother of Kim Joon. She is a cardiologist who is also responsible for killing Kim Joon as she harvested his heart for her son Moo-gang to live prior to the series. Towards the end of the series, she was confronted by her angered son Moo-gang who is possessed by the grim reaper which is the soul of Kim Joon after she murdered her older brother two decades ago. In the end of the series, she writes a note in which she apologizes to both Moo-gang and Kim Joon before she commits suicide from drug overdose.

Kim Jung-young as Ha-ram's mother
She is the mother of Ha-ram who recognizes Han Moo-gang as the grim reaper when it glows orange on his neck and wants him to stay away from her daughter.

Kim Hyung-min as Kang Soo-hyuk, Ha-ram's father
He is the father of Ha-ram who is the previous grim reaper 444 and was killed by an unknown assailant.

Go Seung-bo as Hoon-seok, Ha-ram's stepbrother

Park Jung-hak as Ha-ram's stepfather

Kim Tae-Woo as Grim Reaper #444

Park Doo-sik as Je Soo-dong/Grim Reaper #419

Jo Jae-yoon as Grim Reaper #007

Lee Kyu-bok as Grim Reaper #416

Jung Jun-won as Jang Hyun-soo, #416 real form

Lee Do-kyung as Oh Chun-soo, Man-soo's father

Choi Min-chul as Oh Man-ho, Man-soo's half-brother

Choi Won-hong as Oh Sang-min, Man-ho's son

Kim Jae-young as Leo/Kim Woo-sik

Oh Cho-hee as Tiffany/Lee Young-hee

Kim Young-sun as Man-soo's mother

Lee Hae-young as Min Jae-hong

Woo Hyun as Wang Yong-chun, man with spider tattoo

Lee Kwan-hoon as Chen (Man with missing finger)

Bae Jung-hwa as Han Jin-sook

Lee Hyo-je as Kim Joon/Han Moo-chan
Kim Joon is the older brother of Han Moo-Gang, and is renamed Han Moo-chan after being adopted by Moo-Gang's mother. Kim Joon is the only person to have witnessed all of the serial murders that happened two decade prior to the storyline. He was shot in the head by an unknown assailant shortly afterward, but survives to call his adoptive mother, Seo Young-hwa, for help. She eventually finds Joon unconscious, and assumed that he was on the brink of death, so she uses her skills as a cardiac surgeon to secretively harvests his heart to save Moo-Gang. To cover up his death from arousing suspicion due to his missing heart, she hides his body in a car and pushes it off of a cliff into the ocean. This incident leads Kim Joon to become a grim reaper, Black (#444), who then loses all of good memories from when he was living as Joon Kim. Black as a grim reaper is cold and collected, and prior to the events of the main storyline, is unswayed by the emotionally ridden nature of death, something unusual for grim reapers which he takes much pride in.
Moo-Gang's mother then moves to the US, where Moo-Gang is reared. Eventually, Moo-Gang returns to Korea to become a detective and investigate his brother's mysterious death, running into Ha-ram when ordering dinner. Eventually, he discovers her ability of premonition and tries to save lives using her gift, but is himself killed in a mysterious hostage situation.
Meanwhile, Black is having issues training a new partner in the grim reaper work, and eventually is forced to find him when he goes missing. He discovers Moo-Gang's corpse and inhabits it, and realizing his luck with finding a detective with deep connections to a person capable of seeing other grim reapers, lives as Moo-Gang to hunt down his missing comrade.