In 2006, she starred in the South Korean-Japanese series Tree of Heaven and later received further recognition for her leading roles in the television dramas You're Beautiful (2009), The Heirs (2013), Pinocchio (2014–2015) and Doctor Crush (2016).In 2015, Park ranked 33rd in Forbes Korea Power Celebrity list and 12th in 2017.Later there were rumors that he had been dating various other actresses but the rumors were never attended to.However, in 2015 it was evident that he had been dating his co-star, Suzy Bae. But at present there have been strong rumors that he is having an affair with co actor, Park Shin Hye.
Presently, Park Shin Hye is tied up with her commitment to .During the press conference, Kim was asked if he ever felt uncomfortable acting romantic scenes with an actress who is almost 10 years younger than him. “Park and other junior actors rather felt comfortable with me and treated me like their brother who is a few years older than them,” Rae Won said.“So everything went naturally without having to discuss much about how to act.” According to “I’m really happy because viewers loved the drama very much,” he said, adding that he would love to do another romantic drama if possible.There are rumors floating in the air that Park Shin Hye and Song Joong Ki might be seen together in a new drama series. Lee Min Ho spoke in an interview earlier that Song Hye Kyo is his ideal type.There has been no official word on the development yet. Since then rumors starting doing the rounds that they were a couple.