Responses
Spoiler alert!!!!
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If you read the raw, Yoonsung's sister in law told Hakyung that Yoonsung already know that Hakyung is a boy. After that, Hakyung suddenly remember this exact time (this chapter) when yoonsung start to act weird and give him a cold shoulder. So I assumed that Yoonsung start to guessing that MC is a boy by this time... Maybe our mc did something when he drunk the last time they go together to Seoul. Or idk, I haven't read the novel yet.
wait i read both officals and non but why did he gave his cardigan tho like is it bcs hakyung's waist looks sexy or bcs the dress is so bad on covering the man waist so yoonsung gave him an outer layer?