K-Pop's 10 Worst Idol Group Debuts

10. Rainbow - Gossip Girl


9. Wassup - Wassup


8. ZE:A - Mazeltov


7. Block B - Freeze!


6. Stellar - Rocket Girl


5. U-KISS - Not Young


4. Nine Muses - No Playboy


3. Girl's Day - Tilt My Head


2. Super Junior - Twins


1. M.O.A - I'll Call Ya