"Morning on Jeju Island, noon on Ulleungdo Island?! She must be watched out for!
Sooji, a six-year veteran of the National Intelligence Service posing as a travel agency employee, whose past could be exposed, but her identity must not. As a result, she often told lies to her boyfriend Tae Joon, and in the end, Tae Joon left Sooji without saying goodbye. Three years later, while tracking a corporate spy disguised as a cleaning staff member, Sooji accidentally meets Tae Joon again, who is now an international accountant. Sooji is once again captivated by Tae Joon when she sees him.
I'm not just an ordinary accountant!? He must be watched out for!
Tae Joon, exhausted by the countless lies from his lover Sooji, left a message that he would leave Korea and went to study in Russia. Three years later, disguised as an international accountant and working as a member of the overseas branch of the National Intelligence Service, although a novice, he made mistakes everywhere, but with infinite enthusiasm, he took on his first field mission: to track Russian gangs. During the mission, he met Sooji by chance. Although he was somewhat surprised by Sooji's job as a hotel cleaner, the wonderful feeling from before still lingered.
The couple full of secrets will present an infinitely suspenseful showdown!
Their respective targets are actually all characters involved in the same event, the group stealing domestic technology and selling it overseas. However, Sooji and Tae Joon, unaware of the situation, always bump into each other during their missions and begin to suspect each other's identities...