Guess who is Sarah Song's idol?

It is a dream for everyone including artistes to take photo together with their idol and artiste, Sarah Song (宋熙年) is one of the fortunate ones being able to realise her dream. On Weibo, she shared photo of herself and Louis Koo (古天樂) and Sarah was seen smiling sweetly. She left a message: "I have been waiting for this photo since joining the entertainment industry and I really waited very long!