What actors and actresses appeared in Imaginary Boyfriend - 2013?

You're likely thinking of the Korean drama "Imaginary Boyfriend" (2012), which starred:

* Ji Hyun-woo as Kang Ji-wook

* Jung Yoo-mi as Yeon Ae

This drama was a huge success and was known for its light-hearted and heartwarming story.

There was no "Imaginary Boyfriend" movie in 2013. If you are thinking of a different title, please provide more details.