Drama “Love Song” Leading Casts, Yoon Eun Hye and …?

Maybe this is the way Yoon Eun Hye is paying respect to the late Park Yong Ha. Yoon Eun Hye decided to continue being the lead actress in the drama “Love Song“. Many people expected this project would be canceled after Park Yong Ha’s death, but after going through the mourning period, at July 8th the producer decided to continue this project and got the confirmation from Yoon Eun Hye that she will continue this project. This drama production is supposed to start on late July, but since they are still busy looking for another  actor to replace Park Yong Ha, it will likely to be delayed.
Well, my hope is as clear as it should be the best actor to fill in the blank. 

[info and image source]