Kim made his small screen debut in 2016 and gained attention with his role as Gong Hyo-jin's younger brother in the romance comedy Don't Dare to Dream.[3]
Kim then featured in 4Men's Music Video Break Up In The Morning.[citation needed]
Later in the year Kim was cast in a lead role in KBS2 drama special Buzzcut Love.[8]
In 2018, Kim starred in JTBC's youth series titled Welcome to Waikiki playing a cynical but kind-hearted movie director.[9] The series was popular across Asia and solidified Kim's status as a versatile actor.[citation needed]
He then starred in the 4DX VR movie Stay With Me alongside Seo Yea-ji playing the role of an aspiring musician with stage fright.[10][unreliable source?] Kim lent his vocals to the OST of the movie titled Moonlight.
In July 2018, he starred in MBC melodrama Time alongside Girls' Generation's Seohyun, playing a chaebol whose time is running out due to his failing health.[11] During the press conference for the drama, he was criticised for "answering questions unenthusiastically" and for refusing to link arms with his co-star Seohyun.[12][13] He explained that it was because he was trying to stay in his character from the drama.[13] He withdrew from the series halfway through its run, officially citing health reasons.[14]
2019–present: Comeback and international fame
Kim returned to television in December 2019 when he joined the tvN romance drama Crash Landing on You alongside Hyun Bin, Son Ye-jin and Seo Ji-hye.[15] It became the highest-rated tvN drama and the third-highest-rated Korean drama in cable television history. Kim's portrayal of Goo Seung-joon, former fiancé of Yoon Se-ri (Son Ye-jin) and eventual love interest to Seo Dan (Seo Ji-hye), received positive reviews from audiences. His character's name "Goo Seung-joon" went on to trend at No. 1 in Korea's realtime search rankings, which he later described in an interview as incredibly rewarding.[16]
On June 5, 2020, it was confirmed that Kim would lead tvN's fusion sageuk drama, Mr. Queen alongside Shin Hye-sun playing the role of King Cheoljong.[18] The drama aired from December 2020 to February 2021. On February 15, 2021, Mr. Queen became the seventh-highest-rated Korean drama in cable television history and the fifth highest rated tvN drama on record.[19]The Korea Times article praised Kim's complex portrayal of the two-faced King and noted that he "left a deep impression on viewers with a heavy presence that took the center of the play."[20] Kim contributed his vocals to the soundtrack with the song Like the First Snow; for which he also wrote the lyrics.[21]
In September 2021, Kim signed with Story J Company[22] followed by movie and drama casting news in 2022.[citation needed]
In January 2022, his agency confirmed that he will appear as a Detective in an indie film called Se2cret.[23]
In 2023, Kim returned to television with MBC's Kokdu: Season of Deity opposite actress Im Soo-hyang playing dual role of a Grim reaper and doctor.[24] Kim received praise for 'Perfectly portraying two conflicting characters' through a variety of charms.[25] He also lent his vocals to the opening theme song of the drama titled I am.[26]
In April 2021, South Korean local tabloid Dispatch revealed alleged text messages between Kim and actress Seo Yea-ji and pointed out requests from Seo as the reason behind Kim's behaviour at the Time press conference.[12]"[12] In response, Seo's agency, Gold Medalist, denied the claim that she was the reason behind Kim's behaviour and abrupt exit from the series.[28] On April 14, he posted a personal handwritten apology.[29]
On May 12, Kim's representative released a statement to announce the expiration of his contract with O& Entertainment and to address the actor's health condition while filming Time in 2018.[30] Kim claimed that his agency had failed to fulfill their duty, and that he would take legal action against them for defamation and spreading false information.[31] The same day, YTN revealed that they had obtained Kim's hospital records which showed that he was diagnosed with anxiety disorder, panic disorder, sleep disorder, and having depressive episodes.[32] After the handwritten apology, he met Time director, Jang Jun-ho, who expressed his willingness to work with him again.[33]
^ abYoo, Ji-hye (July 20, 2018). [Oh!쎈 이슈] "역할 몰입해 실수"..김정현의 무표정 논란, '시간'만이 답(종합) [[Oh! Strong Issue] "A mistake by immersing in a role"..Junghyun Kim's expressionless controversy, only 'Time' answers]. OSEN [ko] (in Korean). Archived from the original on May 10, 2021. Retrieved May 10, 2021 – via Naver.
^김정현 '철인왕후' OST 참여 [공식]. Sports Trend. February 9, 2021. Archived from the original on February 9, 2021. Retrieved February 15, 2021 – via Naver.
^Jeong Hee-yeon (September 24, 2021). 김정현 전속계약, 김태희 소속사行 "연기 열의 [공식] [Kim Jung-hyun's exclusive contract, Kim Tae-hee's agency "Passion for acting" [Official]]. Sports Donga (in Korean). Archived from the original on September 24, 2021. Retrieved September 24, 2021 – via Naver.
^ abJeong Hee-yeon (January 28, 2022). 김정현 복귀, 영화 '비²밀' 출연 [공식] [Kim Jung-hyun returns, starring in the movie 'Secret Secret' [Official]] (in Korean). Sports Donga. Archived from the original on January 28, 2022. Retrieved January 28, 2022 – via Naver.
^ abYoo Jeong-min (September 26, 2022). 김정현·임수향, '꼭두의 계절' 캐스팅...탄탄한 호흡 예고 [Kim Jung-hyeon and Im Soo-hyang cast in 'Season of Kkokdu'... Strong breathing notice] (in Korean). iMBC. Archived from the original on November 3, 2022. Retrieved September 26, 2022 – via Naver.
^강서정 (February 19, 2023). 김정현, 꼭두vs도진우 1인 2역으로 '셀프 연기배틀'('꼭두의 계절') [Kim Jung-hyun, Kokdu vs Do Jin-woo in a 'self-acting battle' ('Kokdu Season')] (in Korean). OSEN [ko]. Archived from the original on February 19, 2023. Retrieved February 19, 2023 – via Chosun Ilbo.
^안태현 (February 3, 2023). 김정현, '꼭두의 계절' OST 첫 가창자로 나선다 [Kim Jung-hyun, the first singer of the 'Kokdu's Season' OST] (in Korean). Archived from the original on February 19, 2023. Retrieved February 19, 2023 – via Naver.
^Jeong, Hee-yeon (April 14, 2021). [전문] 김정현 사과문 "변명 여지없이 죄송" 서예지 언급 無 [[Full text] Kim Jung-hyun's apology: "Sorry for no excuse." No mention of Seo Yea-ji]. Sports Donga (in Korean). Archived from the original on May 10, 2021. Retrieved May 10, 2021 – via Naver.
^Ho-young, Lee (March 27, 2024). [단독] 김정현, '미녀와 순정남' 후속 '다리미 패밀리' 주연 발탁 [[Exclusive] Kim Jeong-hyun selected as lead in 'Iron Family', follow-up to 'Beauty and the Innocent Man']. Sports Chosun (in Korean). Retrieved March 27, 2024 – via Naver.
^Hwang Hwang Young (January 11, 2025). "'개소리' 이순재, 'KBS 연기대상' 역대 최고령 눈물의 대상[종합]" [Lee Soon-jae, the oldest tearful grand prize in history at the 'KBS Acting Awards [Comprehensive]]. JTBC (in Korean). Naver. Retrieved January 11, 2025.
^2024 KBS 연기대상 인기상 투표 [2024 KBS Drama Awards Popularity Award Voting] (in Korean). KBS. Archived from the original on December 25, 2024. Retrieved December 25, 2024.
^Im Jae-seong (December 26, 2024). "'2024 KBS 연기대상' 대상 후보 공개…'개소리' 이순재 등 6명" ['2024 KBS Drama Awards' Grand Prize Candidates Revealed... 6 People Including 'Doggy Talk' Lee Soon-jae]. KBS (in Korean). Naver. Retrieved December 26, 2024.