I don't think it's related to jjongah? the OP basically says that dance/dancing is (as expected) a model's weakness, because the moment the music started playing, HJH froze up, even though he had 5 girls around him, and he could only smile in embarasssment. But after the music played a few times he got more comfortable and hugged those to his left and right, and there was a sense that he was enjoying himself.
Second post says that HJH's jacket was the one from his stylist friend, since the OP saw him wear at at one of their gatherings(SNS photos probably). HJH was super shy/embarassed in the middle of the dance floor, being surrounded by beautiful girls. Probably because one of them exposed a lot of chest/cleavage, he didn't dare look and instead kept his eyes closed, because if he just glanced downwards he would have seen everything
(I went to the OP's weibo to have a look but there's no much context for this at the moment! May be WGM related or something else altogether!)