The indie duo 10cm revealed a picture with Yoo Hee Yeol.

On November 25, 10cm posted on their Facebook, "10cm X YHY Sketchbook, the long-awaited reunion of the father and his sons, 10cm and Toy(Yoo Hee Yeol)! 'Dad, how could you do this to us?...'" along with a picture.

In the picture, Yoo Hee Yeol is brightly smiling at the camera and the two members of 10cm are standing next to him. Kwon Jung Yeol is pretending to be upset at him, looking to the side.

10cm and Yoo Hee Yeol released their new albums with one day gap between the two. 10cm released their 3rd album 3.0 on November 19 and Toy released Dacapo on November 18.

10cm said, "Yoo Hee Yeol told us to not worry because he won't be able to release a new album within this year but he released it a day before us. How could 'father' do this to his 'sons'?," arousing laughter.