Cameos of KPOP celebs feature in KBS "Producer"

Ep.1 Taeyeon, Seohyun, and Tiffany of Girls' Generation-TaeTiSeo
in KBS cafeteria 

Ep.3 Hani of EXID
Up&Down dancing in police custody lol

Ep.3 Sandara Park (2NEI), Kang Seung-yoon (WINNER), and Kim Ji Soo
as new casting members of 1 Night 2 Days

Ep.3 Yoo Hui Yeol, Shin Dong Yeop, and Jeon Hyun Moo

Ep.3 Lee Young Ja & Shin Dong Yeop as hosts of Hello Counselor
Baek Seung Chan (Kim Soo Hyun), Ra Joon Mo (Cha Tae Hyun), and Tak Ye Jin (Gong Hyo Jin) appeared on the talk show.

Ep.3 Jang Hyuk & Lee Chun Hee
as Tak Ye Jin (Gong Hyo Jin)'s ex-boyfriends

Ep.3-4 JYP (Park Jin Young)

Ep.3-4 Yoon Yeo Jung & Hwang Shin Hye
as existing members of 1 Night 2 Days

Ep.6 Lee Seung Gi
He is very decent to everybody to leave a good impression.

Ep.8 Go Ara as Cindy (IU)'s fake friend
She seems bad-tempered, but she is a good girl at heart.

Ep.10 Ep 6 Jung Joon Young & Roy Kim as Cindy's anti-fans
They were so fascinated by her truth so that they became a big fan of Cindy.