Kim Ha Neul meets Jang Dong Gun as the homeroom teacher of his son, Lee Jong Hyun.
On July 15th's episode of 'A Gentleman's Dignity', Kim Do Jin (Jang Dong Gun) demands his son, Colin (Lee Jong Hyun), to attend school while he is in Korea. He explains that he met his three best friends while in high school. He orders Colin to attend school, saying that "this is how Korean Dads are".
Choi Yoon (Kim Min Jong), who is put in charge of Colin's matriculation, explains to Seo Yi Soo (Kim Ha Neul) that Colin might be attending the school she teaches in. Seo Yi Soo didn't avoid the situation.
Colin not only begins to attend Seo Yi Soo's school, but also becomes her student. She tells Colin that "her rule is she must have a discussion with the parents of all student. Therefore, bring your parents in." As requested, Kim Do Jin appears at school to have a discussion with Seo Yi Soo.
Later in the episode Seo Yi Soo confesses to her friend Hong Sera (Yoon Se Ah), "I'll tell you a funny story. Colin is now my student...I could have avoided the situation, but I didn't. If I did, I wouldn't be able to be Do Jin. If I call, he will come."
