On this week's 'Masked King,' another idol impressed the audience and panelists with his vocals! 

For the first round, the idol, who hid behind an identity called 'Rob Star,' went up against Mermaid Princess. The two harmonized to Tashannie's "Warning," moving the audience members with their sweet and emotive voices. Though it was a close match, more votes went to Mermaid Princess, prompting Rob Star to remove his mask and expose his identity. Some of you may have guessed already, but the idol behind Rob Star turned out to be B1A4's CNU! 

What did you think of CNU's performance on 'Masked King'? Did you have an inkling that it was him behind Rob Star?