Ha Seok-jin

Actor

★ The Devil's Plan S1 winner

하파고

In the game0 pieces

An actor who studied mechanical engineering at Hanyang University, Ha Seok-jin has been acting since around his 2005 drama Sad Love Story. A long run as a regular on tvN's Problematic Men earned him a 'brainy guy' image and the nickname 'Ha-pago'. On season 1 of The Devil's Plan (2023), he spent much of the game on the minority side against a large alliance, then surged in the late calculation games and beat Gwe-do 2-0 in the final to become the show's first champion. He returns for season 3 as the inaugural winner.

Did you know

Before The Devil's Plan, his only work with producer Jung Jong-yeon was guest spots on The Great Escape; season 1 was his first regular role on one of his shows.
The Devil's Plan was the first variety show he filmed while staying on set.
He said after season 1 that he would not return for another season, but changed his mind for season 3.
He is one of three returning Devil's Plan players in season 3, along with Kim Dong-jae and Jung Hyun-gyu.
Jang Dong-min, Hong Jin-ho, Oh Hyun-min, John Park and Stella Jang all appeared as guests on Problematic Men while he was a regular, so he already knows several of his season 3 rivals from TV.

Survival show record

2023The Devil's Plan Season 1 (Netflix)★ Winner
Cracked the hidden secret of the game pieces first, together with Lee Si-won, and won both 'Nine Men's Morris' and 'Hexagon' in the final to beat Gwe-do 2-0, taking home 250 million won.

Background

Mechanical engineering, Hanyang University

Acting debut (drama Sad Love Story, etc.)

Regular on Problematic Men (tvN)

Became known as a 'brainy guy'; his strength in math puzzles earned him the nickname 'Ha-pago'.

Guest on The Great Escape S2 and S3 (tvN)

Appeared with the Problematic Men team in S2's 'Murder Prison' and made a cameo in S3's 'Back to Gyeongseong'.

Crime Scene Zero (Netflix)

Appeared in episodes 7-8, playing alongside Jang Dong-min.

Previous shows only (excludes this season). From news and Namuwiki, as of 2026-10-13

Namuwiki: The Devil's Plan record (Korean) ↗Namuwiki profile (Korean) ↗

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Did you know

Before The Devil's Plan, his only work with producer Jung Jong-yeon was guest spots on The Great Escape; season 1 was his first regular role on one of his shows.

The Devil's Plan was the first variety show he filmed while staying on set.

He said after season 1 that he would not return for another season, but changed his mind for season 3.

He is one of three returning Devil's Plan players in season 3, along with Kim Dong-jae and Jung Hyun-gyu.

Jang Dong-min, Hong Jin-ho, Oh Hyun-min, John Park and Stella Jang all appeared as guests on Problematic Men while he was a regular, so he already knows several of his season 3 rivals from TV.