Season 1

Choi Daniel

Nam Chi-Won

Age 31 (now 40)

Baek Jin-hee

Jwa Yoon-Yi

Age 27 (now 36)

Kang Hye-jung

Wang Jung-Ae

Age 35 (now 44)

Lee Won-keun

Hwangbo Yool

Age 26 (now 34)

Cha Joo-young

Ma Bo-Na

Age 27 (now 36)

Jung Hye-in

Park Kyung-Rye

Age 27 (now 35)

Kim Ki-bang

Park Chi-Soo

Age 36 (now 45)

Lee Ji-ha

Yoon-yi's mother

Age 47 (now 55)

Hong Kyung

Jwa Tae-Yi

Age 21 (now 30)

Kim Chang-wan

Do Tae-Geun

Age 63 (now 72)

Jeong Soo-young

Moon Soon-Young

Age 35 (now 44)

In Gyo-jin

Jo Sang-Moo

Age 37 (now 45)

Min Jin-woong

Woo Chang-Soo

Age 31 (now 39)

Moon Ji-hoo

Min Deul-re

Age 26 (now 35)

Park Kyung-hye

Goo Kye-young

Age 24 (now 33)

Kim Soo-yeon

Wang Mi-ae

Age 28 (now 37)

Song Ji-ho

Go Myung Suk

Age 25 (now 34)

Sung Hoon

Lee Kyung-joon

Age 34 (now 43)