A Safe Oppa

After breaking up with her trashy ex-boyfriend, Song Ayun is introduced to a dating app by a friend. There, she starts chatting with a man known as “Smiling Man” and even ends up having phone sex with him?! But for some reason, Smiling Man’s voice sounds strangely similar to that of Joo Sanghyeon, her friend’s older brother. Suspicious, Ayun opens the dating app and sends him a message… and Sanghyeon oppa’s phone rings! Ayun assumes she is safe because she believes he has no interest in her. But as Sanghyeon begins pursuing her without hesitation, she realizes far too late— This oppa isn’t safe!