“Birds listen to what’s said during the day, and Seo-woo listens to what’s said at night.” Seo-woo’s daily life of hiding and selling information is always full of tension. But one day, Jin Lee, a 100% emotional F-type member, knocks on Seo-woo’s door... Something feels suspicious… He’s definitely from the opposing organization… Strangely, this person is so easy to talk to and my heart keeps loosening up? The tense and suspicious relationship between a 100% tense informant and a 100% emotional F-type member(?)! Is this emotion a plan or is it sincere?