[citation needed] 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.

[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.

[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.

[14] 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.

[16] In May 2020, Kim made a cameo appearance in his Crash Landing on You co-star Seo Ji-hye's drama Dinner Mate playing the role of her long-term boyfriend.

[17] 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.

[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.

[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.

[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.

[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.