Do-kyung's unflappability is put to the test when she meets rash National Intelligence Service agent Kim Ji-sung (Lee Jung-jae).

Acting on instinct whenever he thinks national security is at stake, he often breaks rules and ruffles feathers on the job, bringing him into constant contact, and sometimes conflict, with Do-kyung.

Ha-joon is quick-tempered with a habit of talking aggressively due to the nature of his job with airport security, watching over thousands of surveillance cameras.

But Ha-joon's affections remain unrequited, because Ji-sung and Do-kyung, despite struggling with memories and misgivings from the past, find themselves falling for each other.

Source: TNS Media Korea Japanese entertainment film Dentsu Inc. bought the series' broadcast rights for reportedly ¥200 million.