Based on Yayaoi Ogawa's Japanese manga "Kimi wa Pet" serialized from 2000 to 2005. The comic won the 2003 Kodanisha Manga Award.
Actor Jang Keun-Suk will take dance lessons for his role in "You're My Pet".
Filming finished August 28, 2011, taking 100 days to film the movie. The last scene shot involved in Kang In-Ho (Jang Keun-Suk) going over to Ji-Eun's (Kim Ha-Neul) work place and asking her to go out to have fun.
On July 6th, an open press day was held in Seongbuk-dong, Seoul, South Korea. The scene being filmed at the Diplomatic Residence Complex, Seongbuk-dong, Seoul, involved Ji-Eun (Kim Ha-Neul) finding a box in front of her house. In the box sits In-Ho (Jang Keun-Suk). This is when the two main characters first meet. Approximately 50% of the shooting has been completed and the movie is expected to be released sometime in the 2nd half of 2011.