Kim Soo-hyun arrives at Nanjing for 2014 Youth Olympics

South Korean actor Kim Soo-hyun(C) arrives at Lukou International Airport in Nanjing, capital of East China's Jiangsu province, on Aug 14, 2014. Kim Soo -hyun arrived here on Thursday to take part in the opening ceremony of Nanjing 2014 Youth Olympic Games. [Photo/Xinhua]

South Korean actor Kim Soo-hyun has been spotted in Nanjing, capital of east China's Jiangsu Province.

Kim's agency has revealed Kim will sing the theme song at tomorrow's opening ceremony of the Youth Olympic Games at the Olympic Sports Center.

But event organizers are not confirming the arrangement, saying they want to keep this secret until last minute.

His agency also claimed Kim will be on stage with other stars from different countries.