In 1996, he achieved recognition in the film industry with the script for The Case of Park Bong-gon's Runaway from Home, which marked the beginning of his career as a screenwriter and director.

Sign was recognized for its fresh approach in unearthing the truth behind a murder case by incorporating the unfamiliar subject of forensic science.

[6] On March 5, 2017, Kim was announced as the creator and screenwriter for the Netflix political period horror thriller series Kingdom.

[17] On June 15, the agency Media Lab Seeso reported the news of an exclusive contract with Kim Eun-hee, who is called the 'Master of Genre'.

[18] On March 4, 2022, Kim donated 30 million won to the Children's Fund in Ukraine, along with her husband, Jang Hang-jun, to help Ukrainian victims in Russian invasion.