seo eun-yu, the youngest employee in her second year at baekmoon group, belongs to the TF team led by baek ki-jo. The grandson of the founder baek ki chul, known as a talented person who studied abroad, Eun-Yu true identity is a spy under the order of choi seolhwa baek ki Jo's new mother and political enemy! However, eun-yu, who fell in love with baek ki-jo the moment they met, is flustered when baek ki-jo, unexpectedly confessed his feelings. " Just for one month" not as a boss but as a man, date me. Unable to refuse the baek ki-jo' offer. Eun-yu begins a tightrope walk between Choi Seolhwa , who is watching her every action and baek ki jo, who is boldly approaching her.