Initially showing their masculinity and fierce image from their MV teaser and photos, fans who are anticipating for Jackie Chan's group apparently didn't expect their debut stage.

Contrary to their dark concept and masculine appeal, the new quartet display a soft jazz music accompanied with slow-tempo rap and their sweet vocals.

Fans commented, "I didn't expect this. I thought they are going to have bad-ass choreography when I saw their MV teaser.","Totally unexpected from these tall men to sing a slow song. Interesting!","I'm looking forward for more performances!", and so on.

Watch their debut performance of 'At First' in M!Countdown below: