Fanyui is a fellow mercenary who shares a history with Ryou from their days on the battlefield, likely in Central America. She was seriously injured and lost her left eye while fighting alongside Ryou. Because her fiancé refused to marry her due to her injuries, she demanded to be left behind while the others withdrew from the conflict. Instead, Ryou extracted her from the battlefield, promising to take her fiancé's place if she did not lose the will to live. Ever since, Ryou has been haunted by her presence, fearing that she might actually force him to fulfill his promise. She occasionally returns to Japan, staying at Ryou and Xiang-Ying's apartment whether invited or not. She currently commands the elite mercenary unit known as the "black panther". She has also adopted approximately 20 child orphans around the globe and claims them to be their (Ryou and Fong's) children, much to Ryou's annoyance. When Xiang-Ying jokingly noted that if they were regarded as "Pa-Pa's" children, they would be her siblings, Fanyui was overjoyed and insisted Xiang-Ying call her "Ma-Ma". Since Xiang-Ying reserved "Ma-Ma" for Kaori, she never used the term for Fanyui, instead using "Fang-san". Since Kaori's death, Fanyui has been worried about Ryou's state of mind. She had him promise to send her an email each year on her birthday (Christmas Day) so that she would know he was all right. Starting from volume 15 of the manga, he always forgets, causing some comical situations.
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