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We have to remember that he was raised by his grandmother. He was raised to be polite, helpful, respectful and appreciative. He must have been treated awful almost He's entire life. He will do whatever it is he needs to help his grandmother, and not wanting to embarrass her or bring her any stress. So despite the bad treatment he's receiving from jaekyung,He still was able to help him financially So he's going to continue to ENDURE this bad treatment. Until the plot twist.