Choo Gyeong Sook
Actor Name: Kim Hye Ri
Gyeong Sook was married to a wealthy older man when she was 19. Her mother-in-law often gave her a hard time, and she does the same to Hyun Joo. After her son Jung Soo died, she eventually remarried, and by a twist of fate became subordinate to Hyun Joo as Gyeong Sook's new husband is Hyun Joo's husband's nephew.