Cha Gye-eul and Hong Yira have lived in the same house since the age of 9. In twenty years, he has become her friend, her landlord, and her boss. Cha Gye-eul was rich. He founded a lingerie company called Florence where Hong Yira worked for him, and it was a successful company. Unlike Gye-eul, Yira was from a poor family and had had to mature early. But these two, a pair that should not have gotten along, were the best of friends because of Yira’s long unrequited feelings for Gye-eul. One night, Yira couldn’t stand it anymore, she confessed. ‘Dude, I love you!’ ‘Hong Yira, you understand that you’re a woman that won’t make me blink if you paraded around naked in front of me?’ Gye-eul didn’t share her feelings. But after the confession, something changed. This is the story of their impure relationship.