The Spoiled Second Miss: A Daily Agenda in an Apocalypse TSSM

The seemingly illustrious, distinguished, and perfect Sim Family had only one flaw:-

The Second Miss: Sim Eun-Hee was anything but perfect.

Always compared to her talented and brilliant twin sister Sim Yoon Mi, Eun-Hee had lived a life of a shadow.

Everything fell apart when Sim Eun-Hee was mistakenly kidnapped instead of her twin-sister by the infamous Underworld's Agent, Hae Seong.

Unfortunately, Hae Seong was now forced to babysit this spoiled, nagging, and pompous lady. Their personalities and upbringing didn't match at all!

Their lives had become more troublesome after the Witches have started dominating society. Sim Eun-Hee targetted as a witch suspect and the 21st-century Witch Hunt going on, who will survive this apocalypse?

Will Hae Seong, a talented Witch Killer be forced to do nothing but hunt down Sim Eun-Hee? Or will Sim Eun-Hee be forced to kill Hae Seong to save her beloved family?
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*Note: Female lead's personality is nasty and sarcastic.
*Be warned before reading: There WILL be OFFENSIVE language.