Me the entire time i was reading this chapter:- The fak is going on? Who dis?

I know that is Choi Mina which is our mc strongest sibling but I don't understand about rabbit stuff. Guess it will tell about this in later chapter

This is what I got from this chapter and previous.
Choi Mina is the oldest daughter in Choi family, she’s number one, strongest and the most possible to be the heir.
She made a business deal with some upper man in Regional Security Organisation.
Those working there to catch awakened criminals to protect the regional areas are required to wear a mask.
They’re been called with name of their mask. This is to cover their identity during mission. Because if their real identity got exposed to other criminals, them & the people around them could get targeted.
The deal Choi Mina made was to let her join the organisation for some kind of purpose she planned.
In exchange, the organisation get some money.

I see now I understand a bit