It's because Joo Jin-woo, Han Dong-hoon, and Jang Dong-hyeok always speak the truth.

Even "Jjit-taek-dong" must know. Regardless of whether they are pro-Lee, pro-Moon, pro-Roh, pro-Cheong, or whatever else, all those "our-style communist" cockroaches are nothing but waste..
They are surviving only due to their survival instinct, but they know that one day, catching all those "our-style communist" waste cockroaches and throwing them into Bongha Noramid—and even going in themselves—is what true patriotism is..