In May 2008, Park collaborated with Jackie Chan to form the I Love Asia Project, prompted by the earthquake tragedy in China. Park produced the song "Smile Again" along with Chan and Korean director Kang Je-gyu to raise funds for relief efforts in Sichuan. The song featured an array of Korean stars including actors and singers as well as figure skater Kim Yuna. The music video was released on JYP Entertainment's YouTube channel on June 30.