Co-star of 'Rooftop Prince', JYJ's Yoochun and actor Lee Tae Sung showed off their friendship, as they spent some time together recently while giving each other their autographs.

On June 16th, Yoochun posted the photo of Lee Tae Sung's autograph above through his Twitter page writing, "The autograph I received from senior Tae Sung," and "I'm glad I'm with Hyung. Thank you~ To our lonesome selves."

At the same time, Lee Tae Sung posted a few photos of Yoochun's autograph through his own personal Twitter writing, "I received an autograph from a celebrity for the first time. It feels strange," and "Our first private meeting..."

Both also shared proof shots of themselves hanging out while having a drink with their caps pulled down over their faces.

It seems the two developed a close bond while filming their drama, despite playing rival roles and have kept in touch even now. Tae Sung is also known to have consoled Yoochun, who was having a hard time with his father's death, with his encouraging tweets during the filming of the drama.

Netizens commented, "In 'Rooftop Prince', they were at war... When did Park Yoochun and Lee Tae Sung become friends?", "I really envy Park Yoochun and Lee Tae Sung's friendship", and "Handsome men hanging out together!"

Source: Yoochun's Twitter