In "Angry Mom" Kim Hee Sun took initiative to protect her daughter Kim Yoo Jung. She said that it was useless to have schools and the Department of Education. She declared that she would become a high school student herself.

On the second episode MBC Wednesday/Thursday mini-series "Angry Mom" (script Kim Ba Di, director Choi Byung Gil) broadcast on Mar. 19, Jo Gang Ja (played by Kim Hee Sun) went to her high school friend Han Gong Joo (played by Go Soo Hee). Han Gong Joo welcomed her saying, "Hey the Sashimi from Bul Gu Po, have you been well?"

After seeing Gong Joo's outfit, Jo Gang Ja said to Han Gong Joo, "So your dreams have come true, Hang Gong Joo. Actually, I have a favor to ask of you. Let's go to school. Not as a teacher but as students."

In order to help her daughter Oh Ah Ran (played by Kim Yoo Jung), Han Gong Joo agreed to help her friend to be acting like a mother. Jo Gang Ja said, "I don't know who's hitting her but she's dying. I'm going to find out who's guilty for all of this and get to the bottom of this."