Byeong-cheol, an office worker, is on his way home after a long day at work when he spots Yeong-hee, a high school classmate, being chased by mysterious assailants. Yeong-hee, strangely dressed in a jumper and helmet over a patient gown, holds a toaster in her hand. Before Byeong-cheol can ask what's going on, Yeong-hee utters a shocking statement that hits his ears. "First of all, I'm not from Earth."