Series

18 Again

“You're young again. You're at an age full of dreams and hope. What's your dream now that you're young again?”

★ 8.3(262)20201h 10m1 season

Drama Comedy Sci-Fi & Fantasy

▶ Watch trailer Official site

18 Again is streaming on U-NEXT in Japan. Availability checked 10 June 2026.

Where to watch 18 Again

🇯🇵 Japan

U-NEXTStream

Good to know

Creator: Ha Byung-hoon
Release date: 2020-09-21
Runtime: 1h 10m
Language: Spanish
Seasons: 1
Episodes: 16
Network: JTBC
Status: Ended
Country: South Korea
Studio: JTBC Studios

18 Again — trailer

About 18 Again

18 Again is a 2020 web series in the Drama, Comedy and Sci-Fi & Fantasy genres, created by Ha Byung-hoon, starring Lee Do-hyun, Kim Ha-neul and Yoon Sang-hyun. It spans 1 season and 16 episodes, and originally aired on JTBC. It holds an average rating of 8.3/10 from 262 viewers. Below you can see where to watch 18 Again in Japan — across streaming, rental and purchase options — along with the full cast, trailer and viewer reviews.

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.

Seasons (1)

Season 116 eps · 2020

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-yeop

Goo Ja-sung

Kim Yoo-ri

Ok Hae-in

Themes & keywords

fake identityhigh schoolhigh school sportsromancebased on movieteenage pregnancyreflectivefather son relationshipfather daughter relationshipage changeromanticearnesthopeful