Issues on Oblivoir class

[KSJhon]

I have encountered some issues.

First, it cannot load hyperref package with options, only success without advances options:
\usepackage[colorlinks,citecolor=blue]{hyperref} >>error
\usepackage{hyperref} >> success

Second, I made index(찾아보기) using imakeidx package, \makeindex and \printindexcommands.
It works well, but unfortunately, I cannot jump to linked page by clicking the index entry at index page.

I have tried several methods, but all are failed.

Is it possible to fix these issues? If ok, then update the Oblivoir class, or guide me how to do.

Thank you in advance.