Rhyu Si-min is incredibly childish, and his motives are transparent.

A few days ago, while criticizing Lee Jae-myung, he also criticized Kang Hoon-sik.
When I thought about why he would criticize Kang Hoon-sik, it's because he is a candidate for Seoul Mayor.
In other words, if he becomes the Seoul Mayor, their pro-Moon faction will weaken further,
so he is preemptively attacking him as a calculated move.
In their minds, they probably think Park Ju-min should become the Seoul Mayor.
But everyone can already see through such simplistic thinking by Rhyu Si-min.
It is truly pathetic. You should just go back to being a "brain-rotted man." Just stick to selling books.