"blurred line" nominal phrase containing an attribute adjective; plural form blurred lines                    expression that illustrates ambiguity and uncertainty with no clear-cut definition of the context it refers to  

"nemesis"noun; plural noun nemeses                      a long-standing rival; an arch-enemy     Johnny and Soyeon never got along. Better said,

Taeil's a barista over at a campus cafe, and a tall man refuses to share his name. — Taeil / Youngho

From the prompt on twitter  @NCTprompts Youngho shouldn't be jealous when his best friend, Taeil goes out with other people, but he can't help but feel relieved every time a date goes awry.

She thought she was all alone on her commute home. Apparently she had an audience.