Actress Kim Sun Ah posted a photo of herself and Rain (Jung Ji Hoon) from the past. 

On Friday, she posted a picture on her me2day. 

"2009 during 'Butterfly Dance.' Ji Hoon was my dance teacher and after another long practice, covered in sweat! But what a memorable picture. He is the actor to the upcoming movie 'R2B'! You can see the sweat and tears of everyone in this movie! Yoo Jun Sang fainted twice while training! I hope it does well! Dae bak!"

'Butterfly Dance' was broadcast on MBC in October of 2008 and they showed off a great couple dance performance. 

Internet users responded by saying, "2009, that's 3 years ago! They look even younger!" "Kim Sun Ah's tango skills shined then!" "World star and top actress in one picture!"

Rain's 'R2B: Return to Base' depicts the Korean air force as they fight above the Seoul skyline and it will be released on the 15th.