Actors So Ji Sub and Yoo Seung Ho showed their close friendship on the set of So Ji Sub's upcoming music video.

It was previously announced that singer�Younha will be lending her voice for the title track, "6 O'Clock... Playground",�while actors�Yoo Seung Ho and�Park Shin Hye will be starring in the MV.

'Little So Ji Sub' Yoo Seung Ho is known to be close friends with So Ji Sub. He's previously starred in his "Lonely Life" MV and filmed an advertisement with the senior actor as well. The two actors were unable to meet up during the MV shoot, so So Ji Sub stopped by the green room to thank Yoo Seung Ho with a few snacks. After receiving heart-shaped chocolates, Yoo Seung Ho joked, "Are you confessing your love to me?"

The photos show the handsome actors smiling as they enjoy a friendly conversation. They met on the 10th when Yoo Seung Ho had to film a club scene with Park Shin Hye for almost six hours.

Stay tuned for the release of So Ji Sub's upcoming rap mini-album, '6 O'Clock� Playground', later this month!