On July 24, he posted on his Twitter "Please show much love for 'Love Rain' in Japan," along with a photo.
In the revealed photo Yoona and Jang Keun Suk are smiling brightly into the camera.
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Those who saw the photo commented "'Love Rain' is going to do well in Japan," "The best Korean Wave stars have gathered," and "Prince and princess are together."
Photo Credit: Jang Keun Suk Twitter