- Country: South Korea
- Genres: Comedy, Romance
- Release: 2015-11-26 (South Korea)
- Director: Hyung Hyup Kim
- Writers: Hyung Hyup Kim
- Language: Korean
- Stars: Ji Eun-seo , Juno , Yeon-hwa Kim , Ah-Reum Lee , Park Cho-hyeon , Tae Won-suk , Kim Yong-jin
- Runtime: min
- Awards: N/A
- AKA: Karşılıklı İlişkiler (Turkey) , Mutual Relations , Gong-jeug-si-saeg , Mutual Relations , Emptiness Is Nothing , Mutual Relations (Korea)空即是色(618sss.com), 공즉시색
- Plot:
Ho-kyeong, Joo-yeong and Yeon-hee are students of an American university who are all pretty and sexy. They either know too much or know too little so they decide to find men who can satisfy them. A lean man who was a former nude model, a younger man who has perfect techniques and a man who thinks very highly of women; these guys start the project!
- IMDB:tt7453636