Word 'PS' was initial to 'phone' and 'sex'.
Filming began March, 2012 and finished June 11, 2012. The final scene filmed took place at Samcheong-dong, Seoul. The last scene involved Yoon-Jung (Kim Ah-Joong) calling in to a radio show and singing over the phone. Main actor Ji Sung was on the set, even though he did not take part in the scene.