Jung Eunji was a top secret agent and bodyguard who has 5 years of experiences. She was assigned to be the bodygurad of Son Naeun. 

Son Naeun was a daughter of an CEO.

Someone is going after him and had sent packages and messages to them warning them the upcoming danger. 

Afraid that the person wants to harm Naeun, then wanted eunji to protect naeun. But it wasn't that easy. It got too much mysteries.. 

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But who knows what would happen between them?

(P.S. ME, I KNOW WHAT WOULD HAPPEN XD)