Yoo Joonghyuk's speech is concise and blunt, often to the point of rudeness. He becomes explicitly rude and threatening when speaking to individuals who irritate him, or who are powerful unknowns. He is sometimes also rude to his own party members, though he looks out for them nonetheless, showing that he cares despite his harshness. 
Kim Dokja is, at his core, a dedicated and loving man. He devotes himself to those he cares for, going so far as to sacrifice his own life
