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Yoo Joonghyuk
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.
Over the course of his regressions, aside from becoming more open to cruelty, he becomes extremely calculating and cold. He kills those he deems threats and supports those who he believes can aid him and never goes for a compromise.