Guk Moon-kwang

Guk Moon-kwang is the secondary antagonist of the 2019 South Korean film Parasite. He was a housekeeper that was fired by the Kims before hiring Choong-sook, the wife of Ki-taek to take that position.

History
After being accepted into the Park home, Kim Ki-jeong gets Mr. Park's driver fired and replaced with her "Uncle" Kim Ki-taek. After that, the Kims get Moon-kwang fired and Choong-sook employed in her place.

On the day after the Kims party, Moon-kwang rings the bell and asks to be let in, claiming that she comes to retrieve something in the basement. As the rest of the family hides, Choong-sook lets Moon-kwang in. In the basement, the former housekeeper opens a secret door to a bunker, where her husband Geun-sae has been hiding for 4 years to avoid the loan sharks.

As Choong-sook threatens to call the police, the rest of the Kims stumbled into view. Moon-kwang quickly captures the Parks' new driver and two tutors addressing each other as father and children. As she threatens to send the clip to the Parks, a fight ensues and the Kims subdues the couple.

The phone rings and they learn that because of heavy rain, the Parks have cancelled the camping trip and will be home soon. The Kims scrambled to confine Moon-kwang and Geun-sae, then clean up and hide, while Choong-sook makes ram-don as requested by Mrs. Park. Moon-kwang breaks free and runs up the basement stair into the kitchen, but Choong-sook kicks her back down, severely injuring her. Geun-sae grieves over her dead body later.