Jo Se Ho posted on his Instagram that he is preparing a performance with Orange Caramel.

With the picture, he said, "Roommate Nana and Orange Caramel! We are practicing for 'Immortal Song' Fighting!"

In the picture, the four are standing next to each other and making friendly gestures. Jo Se Ho is making a 'V' sign.

On June 23, the four of them were on the stage of 'Immortal Song.' This picture was from right before their performance.

The theme of the show was, 'The summer story with friends.'

Aside from Jo Se Ho and Orange Caramel, the other performers were Hwanhee and Gummy, Jung Dong Hwa and Dpinks, Ailee and Shin Bora, Jo Sung Mo and Lim Jung Hee, ZE:A and Nine Muses, and JK Kim Dong Wook and MC Sniper.

This episode of Immortal Song will air in July.