Pemeran Flower Grandpa Investigation Unit

Byun Hee Bong

as Han Won Bin

Pemeran Utama

Lee Soon Jae

as Lee Jun Hyeok

Pemeran Utama

Kim Hee Chul

as Park Jeong U

Pemeran Utama

Jang Gwang

as Jun Kang Seok

Pemeran Utama

Lee Cho Hee

as Jung Eun Ji

Pemeran Pembantu

Park Eun Ji

as Yu Ra

Pemeran Pembantu

Kim Byung Se

as Choi Jae Uk

Pemeran Pembantu

Kim Eung Soo

as Kim Yeong Cheol

Pemeran Pembantu

Shin Gui Sik

as Park Jin U

Pemeran Pembantu

Seo Ye Hwa

as Lee Su Jeong

Pemeran Pembantu

Kim Jin Soo

as Michael Kim

Pemeran Pembantu

Lee Jae Wook

as Park Yeong Gil

Pemeran Pembantu

Cha Jin Wook

as O Gi Hwan [Doctor]

Pemeran Pembantu

Kim Chu Wol

as [Advisor scholar]

Pemeran Pembantu

Kim Byung Chun

as [Lee Jun Hyeok's father]

Pemeran Pembantu

Heo Jin

as [So Ri's mother]

Pemeran Pembantu

Kim Sun Young

as [Jun Hyeok's mother]

Pemeran Pembantu

Lee Seung Ho

as Jung Myeong Ho [Young] (Ep. 1)

Bintang Tamu

Sam Hammington

as [Russian robber] (Ep. 1)

Bintang Tamu

Kwon Eun Soo

as Geum Mae Sil (Ep. 2)

Bintang Tamu

Lee Yong Nyeo

as [Secretary] (Ep. 3)

Bintang Tamu

Jang Se Hyun

as [Fortune teller] (Ep. 6)

Bintang Tamu

Choi Dong Yeob

as [Movie director] (Ep. 6)

Bintang Tamu

Park Hyo Bin

as Kim Jae Hui (Ep. 7)

Bintang Tamu

Jung Min Gyul

as Lee Eun Ju (Ep. 7)

Bintang Tamu

Shin Seong Ha

as Um Si U (High school student) (Ep. 7)

Bintang Tamu

Woo Sang Jun

as Cho Jeong Go (Ep. 8)

Bintang Tamu

Park Yong

as [Doctor] (Ep. 10)

Bintang Tamu

Shin Dong Woo

as Lee Jun Hyeok [Middle-schooler] (Ep. 12)

Bintang Tamu

Kwon Min A

as Han Seol Hui

Bintang Tamu

Park Hyo Ju

as Jeon Hae Jin

Bintang Tamu

Lee Ki Woo (이기우)

as Park Tae Min

Bintang Tamu

Ahn Sung Hoon

as Jeong Hun

Bintang Tamu

Choi Jin Hyuk (최진혁)

as Lee Jun Hyeok [Young]

Bintang Tamu

Park Min Woo

as Han Won Bin [Young]

Bintang Tamu

Park Doo Shik

as Jeon Gang Seok [Young]

Bintang Tamu

Oh Jung Tae

as [Ambulance driver]

Bintang Tamu

Kim Geun Yeong

as [Part-time middle-aged woman]

Bintang Tamu

Kim Jin Young

Sutradara