Kim 'Hero" Jaejoong is the mega superstar, with pretty face and beautiful voice, envied by other entertainers. After his concert, he's kidnapped by some lunatics and locked in a hotel room.

Jung Yunho is the sole heir of Jung Corp. whose envied by his own uncles. His uncles wants Yunho's reputation dead, by sending es to Yunho's hotel room, hoping the medias will catch the news. 

On the way to his room, Yunho bumped into a stranger, thus accidentaly swapped their room's keycard.  Opening the door, instead finding es, he found a tied up mega superstar.

Chaos ensues.

Also, detective Park Yoochun and his partner next door thought all the commotion is caused by criminals they thought hiding there.

And so, the chasing begin.