As Jaejoong of JYJ prepares for his drama role in 'Time Slip Dr. Jin', it seems that his topknot is proving to be quite the formidable opponent.

On May 16th, Jaejoong tweeted the above photo with a caption that read, "The topknot is tight. I think my forehead is about to cave in."

In the photo, Jaejoong is seen wearing the martial artist costume for his character in the historical drama. His displeased face speaks a thousand words as the hairdresser administered a tight topknot.

Followers commented, "The topknot knows no mercy," "This is just funny," and "Thanks for a great laugh!"

In related news, Jaejoong's 'Time Slip Dr. Jin' will be airing its first episode through MBC on May 26th.

Source & Image: Jaejoong's Twitter