2006–2009: Beginnings Ji began his career in musical theatre. He made his onscreen debut in the 2006 short film
Days... and had a minor role in the 2008
television drama You Stole My Heart. He officially debuted in 2008 through the film,
Sleeping Beauty. In 2009, he appeared in
My Too Perfect Sons, playing the timid, youngest brother who ends up raising his best friend's daughter at just 20 years old. The weekend family drama received over 40% ratings. He then took on a supporting role in the action-comedy
Hero.
Smile Again topped the ratings chart for 15 consecutive weeks, and he was awarded "Best Actor in a Daily Drama" at the
KBS Drama Awards. He then played the titular character in 2011 historical-action series,
Warrior Baek Dong-soo (2011). Adapted from Lee Jae-heon's
manhwa,
Honorable Baek Dong-soo, it is an
origin story about
Joseon-era swordsman,
Baek Dong-soo, showing his early years until political intrigue creates a rivalry with his childhood best friend-turned-enemy. The series topped in its timeslot for 13 weeks, and Ji received a "New Star Award" at the
SBS Drama Awards. Later that year, he played the lead role in cable drama, ''
Bachelor's Vegetable Store'' which is based on the true story of Lee Young-seok, a young man who turned a tiny 350-square-feet vegetable store in 1998 into a nationwide franchise with 33 stores. On his first antagonist role in the melodrama,
Five Fingers (2012), Ji played a pianist who envies his older brother's natural gift for music. Ji returned to musical theater in 2013 with
The Days, playing a presidential bodyguard who went missing 20 years ago along with a mysterious female companion.
The Days was a
jukebox musical using the
folk rock songs of
Kim Kwang-seok.
2013–2022: Breakthrough and overseas ventures Ji's breakthrough came through his role as
Toghon Temür (also known as Ta Hwan), the 16th emperor of the
Yuan Dynasty, in the historical drama
Empress Ki. The drama drew solid viewership ratings nationwide throughout its run with an average rating of 35.12%. Ji's portrayal left a strong impression on both the critics and the audience, earning him critical acclaim and recognition. Ji then starred as the titular character in action-thriller television series,
Healer (2014–2015). After the airing of the drama, Ji became popular in China and other parts of Asia. He then took on roles in Mandarin-language dramas such as
The Whirlwind Girl 2 and
Mr. Right. In 2016, Ji starred as the male lead in
tvN's action-thriller
The K2, a bodyguard who is betrayed by his fellow countrymen and falls in love with a girl with PTSD and apparent sociophobia. The drama received favorable reviews, topping cable channel viewership ratings throughout its 8-week broadcast. In November 2016, he co-starred in the promotional web-drama series,
7 First Kisses for Lotte Duty Free. In 2017, Ji starred in the action film,
Fabricated City, playing the role of a jobless game addict who is framed for murder. The same year, he was cast in SBS's
romantic comedy thriller series,
Suspicious Partner, as a prosecutor, which premiered in May. Following his discharge from military in 2019, Ji was cast in the romantic comedy series
Melting Me Softly, where he played the role of a television producer who finds himself waking up 20 years into the future following an unsuccessful human-freezing project. In 2020, Ji was cast in the romantic comedy series,
Backstreet Rookie, based on a webtoon of the same name. He played the role of a former public-relations director of convenience stores franchises, who ends up managing his own convenience store. He also starred in romantic comedy web series
Lovestruck in the City which premiered on
Kakao TV in December 2020. In 2021, he starred in the
Kim Chang-ju's thriller film
Hard Hit, playing a mysterious caller who blackmails the protagonist and his family with a bomb planted inside the car they are driving. In 2022, Ji appeared in the
Netflix series
The Sound of Magic, based on a webtoon of the same name, in the role of mysterious magician Ri Eul. That same year, he starred in the
KBS2 drama
If You Wish Upon Me in the role of an ex-convict who volunteers at a
hospice.
2023–present: New agency In March 2023, Ji ended his contract with Glorious Entertainment. On 14 March 2023, Ji is in the stage on preparing to establish a one-man agency with his manager who has been working with him for more than ten years. In April 2023, Ji signed with Spring Company. On 13 November 2023, Ji was confirmed to be cast in the role of the main character of series
The Manipulated. Ji is set to perform in
Manila on 19 October 2025, as part of IAM WORLDWIDE 's anniversary show dubbed DOMIN8 along with fellow Koreans from
NTX and Philippine pop group
Bini. ==Personal life==