SEE ALSO: ASTRO to reunite with Rocky for upcoming solo concert 'Stargraphy'

Song Hye Kyo's agency rep tweeted on the 16th, "A sudden attack on writer Jae Yeol. Young who went to meet Soo oppa in a long time. One cut taken with director Kim Kyu Tae and lighting director Park Hwan. Everyone warmly welcomed us so we are thankful."

'It's Okay, That's Love' rep told OSEN, "Song Hye Kyo made a surprise visit to the set of the drama and had a good time... She also brought along a food truck for the staff and cast. Since they normally have a close relationship, everyone was delighted."

Song Hye Kyo, Jo In Sung, and director Kim Kyu Tae formed a close friendship through their hit SBS drama 'Wind Blows in Winter'. It has been reported that a lot of the same staff who worked for 'Wind Blows in Winter' also work for 'It's Okay, That's Love', making the reunion even more meaningful.