Lee Jung Shin and Sulhyun switched roles.

AOA Sulhyun posted on her official Twitter, "Taking a break during 'My Daughter Seo Young!' Though I am the teacher in the drama, we decided to change roles. Eun Soo is being scolded by Sung Jae! Please watch this week!" and posted 2 photos along with the comment.

In the photo, Sulhyun is pouting as if she is receiving a lecture from Lee Jung Shin. It appeared that she was being punished, which was funny. In the drama, Sulhyun is the one treating Lee Jung Shin this way and viewers were very entertained to see them this way, playing role reversal.

Lee Jung Shin is playing Sung Jae, who wants to become an actor. Sulhyun plays his teacher Eun Soo, who looks and acts just like Seo Young (Lee Bo Young).