Rising actor Joo Won expressed his interest in his '7th Grade Civil Servant' co-star Choi Kang Hee.

On the January 25th episode of 'Section TV Entertainment Relay', Choi Kang Hee revealed that she joined the drama's cast because of Joo Won's recommendation. Joo Won explained, "I heard a couple of actresses' names come up when discussing who would be my partner. I didn't hesitate for a second and brought up Choi Kang Hee sunbae."

The actress also commented on what it was like partnering up with a much younger actor. She stated, "It's a bit embarrassing when I have to do cute expressions in front of a younger man," and Joo Won responded, "I think noona's cute though."