June 27, 2012 08:03 AM EDT
yunho / Credit: yunho
The two, both born in 1985, have been known as best friends who have been building their friendship since before their debut, which has already marked their 10th year anniversary of being friends.
The musical that they watched together was the musical, "Finding Kim Jong Wook." U-know Yunho's other best friend, actor Kang Dong Ho, is starring in this musical. These two are also best friends, after working together for the musical, "Palace" in 2010.
Before the musical started, Yunho and Park Soo Jin were seen getting off from the same white van. They lined up for tickets like everyone else in the audience and entered the musical hall. Kang Dong Ho, as if he knew that Yunho was there, started dancing at the end of the musical, cheering up the crowd.