4.0
Synopsis
At a difficult place in his marriage and career, a middle-aged man gets a shot at a do-over when he's transformed back into his 18-year-old body.
Genres
DramaComedySci-Fi & Fantasy
Production
JTBC Studios
Languages
EspañolPortuguês한국어/조선말
Production Countries
South Korea
Episodes
Main Cast
Lee Do-hyun
Hong Dae-young / Go Woo-young
Kim Ha-neul
Jung Da-jung
Yoon Sang-hyun
Hong Dae-young (37 years old)
Roh Jeong-eui
Hong Shi-ah
Ryeoun
Hong Shi-woo
Wi Ha-jun
Ye Ji-hoon
Kim Kang-hyun
Go Deok-jin
Lee Mi-do
Choo Ae-rin
Han So-eun
Young Jung Da-jung
Choi Bo-min
Seo Ji-ho
Hwang In-youp
Goo Ja-sung
Kim Yoo-ri
Ok Hae-in
Lee Ki-woo
Choi Il-kwon
Ahn Nae-sang
JBC Director
Yoon Byul-ha
Ye Seo-yeon
Ko Eun-min
Lim Ja-young
Kim Sun-min
Choi Il-kwon [Young]
