Lee Yeon-Doo Nude, Kim Yoo-Yeon Nude, Seol Hyun Nude - Gangnam Blues (2015)

Lee Yeon-doo appears in a nude scene in Gangnam Blues (2015), showing her tits in a sex scene, while Kim Yoo-yeon is also naked demonstrating her boobs, along with a scene featuring Seolhyun.