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yoon gyeong-do was very obviously raped by their father, too. it explains his sudden inquiry about Yoo-Gon and Jung-Hae's sex positions. he raped Yoo-Gon to emasculate him and assert his own masculinity to himself, it angers him that Jung-Hae can find pleasure in something that he never had a choice in, and even more that Yoo-Gon can still hold on to his pride after being raped. he's a pretty good character