Boyfriend One-O

Boyfriend One-O (구친녀소 one-O*) is a 2016 Sandean animated romantic comedy film produced by Kyongi Animation. The film was directed by hwaman artist Nagan Aso, who co-wrote the film with Yeongi Ryu. It features the voices of Yeni Ong, Kiton Dahan, and Chino Hobi, and follows Muku, a teenage boy who cheats on two attractive girls. However, both girls become very close to him, and he must prevent them from meeting each other.

The film was released nationwide on July 13, 2012, and an English-language dub by DubLock was released in February 1, 2013. It received mixed to negative reception, with criticism aimed at its amateur voice acting, slow-paced story, and generic humor. The film evolved into an Internet meme after a short viral video titled "Badfriend One Oh No" was published on in 2017.