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Imo, Chae Heon is a yellow flag, only because his bottom loves him back, fortunately. Or else he would very likely turn red flag. He is def a obsessed possessive stalker. He entertained dark twisted ideas. He doesnt know how to express his feeling properly. It is understandable, however, since he was abused by his mother and had a crooked childhood. He is very lucky that the bottom has feelings for him too, and is too tolerant of his stalking behaviour