Sung Hayeon, a top agent at Seoul National Intelligence Agency leads a double life as Bang Jayeon, and enjoy a perfect relationship with Kang Hyunwoo, a rich influential chaebol. However their perfect relationship was soon thrown inti chaos when Haeri was paired up with the mysterious enigmatic agent Park Sunghoon who also enjoys a relationship with a woman named Go Minjeong. As the two agents work closely together to take down a dangerous criminal group,Hayeon finds herself falling for her work partner