Actor Ji Sung revealed his masterpiece abs.

Ji Sung plays the role of Hyun Seung of the movie 'My P.S. Partner', a movie about the phone sex incident of two people who do not know each other.

Ji Sung acts as Hyun Seung, a man who was pining after a lost love, but was complete disarmed with a phone call. He daringly shows some skin in the movie. Shin So Yool plays past girlfriend So Yeon while Kim Ah Joong plays the new girl Yoon Jung. Because of his bed scenes with both ladies, he boldly took off his shirt.

To maintain his solid abs, Ji Sung does 2,000 sit-ups every day. Under his soft and cute image, he shows his appeal with his sexy 'keypad abs'.

Ji Sung heightens the anticipation for the R-rated movie 'My P.S. Partner' with his shirtless picture. The movie will premiere in December.