However, his personality changes noticeably when being Hwa-Ryun, which is why she is considered a separate character. As the story progresses, it is revealed that Hwa-Ryun is a real woman living in Japan, whom Fahrenheit was merely imitating the personality and appearance of.
This change is notable because his personality changes dramatically when he assumes the role of Hwa-Ryun, which is why she is seen as a distinct character. As the story progresses, it becomes clear that Hwa-Ryun is an actual person living in Japan, whom Fahrenheit was merely emulating her personality and appearance.