Not in real life. They were onscreen lovers in the 2008 Taiwanese drama Pi Li MIT, but I don't think they're actually dating in real life. However, they are really good friends and keep in touch all the time through Weibo (Chinese version of Twitter).
Many fans want Gui Gui and Aaron Yan to be together. There's even a couple name coined for them (GuiLun)! I myself am a GuiLun fan :)
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