Mina's disappeared, Yeonjoo lost memories.

I'm thinking the one who should get hit that day is Mina's. But they do a mistake, that's why all Mina's family got wipes out. They want inheritance and take over the company. Yeonjoo who doing undercover be a victim, and she also doesn't know the truth about her missing memory. And what happened to her actually. What do you guys think?!