Hankyung was a bodyguard who worked for Choi Siwon to protect him and his family. His real name is Hangeng. He hides his real identity because of some reason. Choi Siwon hired him as his bodyguard because someone has tried to killing Siwon father two months ago. Siwon felt that his family was in danger, so he hired the best bodyguards in the country.

In the mission to protect Siwon family, Hangeng met the fact that the assassin who tried to killing Siwon father was Mr. Bee subordinate. Hangeng and his brother in law Jaejoong involved in this mission because of this case have relation with Mr. Bee. They really hated him so much because both of them were included in the tragedy that happen eight years ago that changed their lives forever. No body knows who the real identity of Mr. Bee is. The only clue that guides them toward Mr. Bee was a tattoo with the words 'B E E' in the wrist of the assassin.

What will happen when Mr. Bee knows about Hangeng real identity and changes his target toward Hangeng? Who will protect him?