Shadow Detective

Detective Taek-rok, who is nearing retirement, receives a threatening phone call and finds himself framed for murder. The mysterious caller, who calls himself a friend, challenges Taek-rok to a twisted game, ordering him to reinvestigate the cases he once handled. To catch the culprit, Taek-rok revisits his long and difficult life with determination. As he follows the trail, he comes face to face with a shocking truth.

Main

• Lee Sung-min as Kim Taek-rok
• Jin Goo as Guk Jin-han (season 1)
• Kyung Soo-jin as Lee Seong-ah
• Lee Hak-joo as Son Kyung-cheon
• Jung Jin-young as Choi Do-hyung (season 2)
• Kim Shin-rok as Yeon Joo-hyun (season 2)

Supporting

Geumo Police Station

• Kim Hong-pa as Seo Gwang-su
• Kim Tae-hoon as Woo Hyun-seok
• Yoo Seung-mok as Bae Young-doo
• Kim Min-jae as Han Ki-yong
• Jung Hae-kyun as Baek Seong-il

People around Kim Taek-rok

• Seo Jeong-yeon as Oh Hye-seong
• Kim Jae-bum as Yang Ki-tae
• Ko Kyu-pil as Gong Ha-neul
• Hyun Bong-sik as Gu Dong-beom

Kim Taek-rok's family

• Kim Soo-jin as Shin Jeong-ae
• Jung Yi-ju as Kim Ji-woo

Drug Organization

• Yoon Je-moon as Cheon Ki-deok
• Oh Dae-hwan as Ma Sang-goo
• Geum Gwang-san as Chung-bok
• Kwon Hyuk-bum as Antenna

People in Geumo

• Song Young-chang as An Hyung-woo
• Jang Seong-beom as An Ju-yong
• Ahn Nae-sang as Jang Seong-tae

People around Lee Young-ho

• Joo Jin-mo as Lee Young-ho
• Choi Byung-mo as Cha Kyung-pil
• Jung In-gi as Won Jae-gu
• Ji Seung-hyun as Woo Jang-ik

Others

• Jung Hee-tae as Lee Jeong-beom
• Woo Mi-hwa as Kim Jin-seon
• Cho Young-jin as Han Jong-seok

The series was announced on Disney+. The series was initially titled as Old Detective but later changed as Shadow Detective. The principal photography of the series commenced in October 2022. The trailer of the series was released on October 11, 2022.

Pierce Conran of South China Morning Post graded both seasons with 3+1⁄2 out of 5 stars. Rhian Daly of NME rated the season with 4 out of 5 stars in her review.