The 13th episode of the KBS drama "Big" that was aired on July 16 featured Jang Mari's (miss A's Suzy) innocent character changing for the worse out of spite.
As usual, Jang Mari was stalking Kang Kyung Joon (Shin Won Ho), who is currently in Seo Yoon Jae's (Gong Yoo) body. While following him around secretly, Jang Mari sees Kang Kyung Joon and Gil Da Ran (Lee Min Jung) hugging each other. However, it wasn't just an ordinary hug. It was a meaningful hug that only two people who love each other could share.
Jang Mari, who was spying on them behind a fence, began to tear up. After seeing Kang Kyung Joon and Gil Da Ran, Jang Mari's harmless character begins to change for the worse. Jang Mari blurts out to Gil Da Ran that Kang Kyung Joon and Seo Yoon Jae are brothers.
Jang Mari says, "Cut off Kang Kyung Joon" and begins to say hateful things to Gil Da Ran. Jang Mari then takes out a ring that resembles Gil Da Ran's wedding ring and lies, "I found your ring."
She then begins to threaten Gil Da Ran by saying, "If you get greedy, both Kang Kyung Joon and Seo Yoon Jae will die. I could lie just to save Kang Kyung Joon. You should do the same. At least lie. Tell Kang Kyung Joon to please go back."
Jang Mari goes further by lying to Kang Kyung Joon that Gil Da Ran knows about Seo Yoon Jae's medical past and that she was only trying to use him to save Seo Yoon Jae.
After hearing the story, Gil Da Ran begins to push Kang Kyung Joon away from her. Kang Kyung Joon is deeply hurt by Jang Mari's lie and begins to cry. Gil Da Ran then breaks up with Kang Kyung Joon while wearing the fake wedding ring Jang Mari gave her.
Jang Mari then begins to believe that she will get exactly what she wished for and plans to go to the U.S. with Kang Kyung Joon.