Do you think Yeo-jin will help destroy her father? I think she might be so stunned for a while that she might not stop Hye-sun, but I can't imagine her helping, even tho he deserves punishment. The filial piety ideal would stop her. Unless her mother was in on the plot, too. (Of course, if Hye-sun takes over the business, there won't be any income for Ilho's wife, but Yeo-jin will still have a job.) Unless Hye-sun tries to tank the company, but that would be dumb.