- Title: 복제인간 / Bokjeingan
- Also known as: Human Clone / Clone Man
- Previously known as: 사자 (四子) / Saja (Four Men / Four Children / Four Sons)
- Genre: Thriller, mystery
- Format: Webdrama
- Episodes: 6
- Broadcast network: Olleh TV / Seezn / SKY / SkyLife
- Broadcast period: 2021-Jun-18 to 2021-Jul-23
- Air time: Friday 22:05
- Original soundtrack: Genesis OST
A mystery human drama in which a man who was digging into his mother's mysterious death meets other human beings one-by-one who has the same face as him and gets caught up in an even larger conspiracy.
- Main Cast
- Park Hae Jin as Kang Il Hoon / Chen / Dong Jin / Michael
- Nana → Lee Shi Ah as Yeo Rin
- Kwak Shi Yang as Choi Jin Soo
- Lee Ki Woo as Kang Il Kwon (Il Hoon's older brother)
- People around Il Hoon
- Seol Ji Yoon as Han Jung Mi (Il Hoon's mother)
- Kim Chang Wan as Woo Ki Suk
- Yoon Ah Jung as Kang Hee Joo
- Park Geun Hyung as Kang Do Hoon (Il Hoon's adoptive father)
- Koo Ja Sung as Kim Min Ki (Il Hoon's secretary)
- People around Yeo Rin
- Kyung Soo Jin → Jang Hee Ryung → Park Jin Joo as Park Hyun Soo (Yeo Rin's friend)
- So Hee Jung as Myung Ja (Yeo Rin's mother)
- Ren as Yeo Hoon (Yeo Rin's younger brother)
- MunMyeong Group
- Byun Jung Soo as Oh Se Jung
- Park Chul Min as Oh Hyung Moo
- Eru as Moon Ho Sung (Il Kwon's secretary)
- Seo Kyung Hwa (서경화) as Secretary Kwon
- Choi Hyo Sang (최효상) as Do Hoon's attorney
- Heo Eun (허은) as Se Jung's secretary
- Gwanak Police Department
- Jo Hee Bong as lead detective
- Mi Suk (미석) as Detective Park
- Keum Kwang San (금광산) as Detective Byun
- Oh Jong Suk (오종석) as Yeo Rin's co-detective
- Lee Ki Young as Woo Ki Hoon
- Oh Mi Hee as Kim Sang Hee
- Park Young Soo as store worker
- Kim Joon Won (김준원) as Han Sang Doo
- Shin Jae Yi (신재이) as Il Kwon's mistress
- Moon Soo Bin (문수빈) as restaurant waitress
- Special guest appearances
- Sung Nak Kyung (성낙경) as gang boss #1 (ep 1)
- Kim Kwang Gyu as Kim Jung Goo (ep 1-2)
- Kim Young as restaurant owner (ep 3)
- Yoo Sang Jae as gang boss #2 (ep 3)
- Seo Bum Shik as suspect (ep 4)
- Lee Ho Jae as man meeting with Il Kwon (ep 5)
- Kang Moon Kyung as Kwon Jo Han (ep 6)
- Kim Ik Tae as tailor (ep 6)
- Kwon Young Kyung (권영경) as woman meeting with Il Kwon (ep 6)
- Lee Sul Goo (이설구) as man working for Kang family (ep 6)
- Choi Jin Hyuk as Choi Jae Hyuk (ep 6)
- Production Company: KT Corp.
- Chief Producer: Kwon Hong Jin (권홍진)
- Producer: Lee Sung Gon (이성곤)
- Directors: Oh Jin Suk → Jang Tae Yoo
- Screenwriter: Kim Je Young (김제영)
- This is a pre-produced drama.
- Filming was set to begin November 2017, however PD Oh Jin Suk walked away from the production on September 19, 2017.
- On October 17, SBS announced that PD Jang Tae Yoo would take over the project.
- Filming began January 2018.
- Nana was originally cast as the female lead, but left the production in 2019 due to the numerous delays.
- Due to the delays in filming, the staff and crew only filmed about 12-episodes worth of content, but it was re-edited down to 6 episodes for its release in 2021.
- The drama was renamed from Four Men / Four Sons to Genesis for its 2021 release.
- The drama was released in June 2021 as part of the 'KT Summer Drama Collage' line-up.
- The production company does have plans for a second season, but also plans to replace all the actors and actresses, as well as the production crew.