Like we know, member who got talent and skill in singing. We will call them as "Vocal line" of their group. In every group will got it such as Super Junior's Kyuhyun, Yesung, Ryewook, 2ne1's Park Bom, 2PM's Jun.K.

SEE ALSO: SM Town planning release of new rookie group!

Same with A-Cube Entertainment who own talent vocalist, Huh Gak and also a member of their only idol group, Jung Eunji's A-Pink. But now, they release a member of their first boyband called AGent and that member is Main Vocalist of his group, Choi Jinwook.

The make A-Cube surprise us with collaboration project of the main vocalist!! There is a rumor that first plan of this duet will be Beast's Yoseob and A-Pink's Eunji but CEO of Cube Unite just change his mind and turn it to be pre-debut single of AGent's Main Vocalist with A-Pink's Main Vocalist!!

Let's see how great they are.