China's foreign minister has been removed from his post one month after disappearing from the public eye. Experts say we may never know why.

• The opacity of China's government means we may never know why Qin Gang was ousted.
• Eurasia Group's Jeremy Chan told Insider that "so much remains unknown about Qin's case."
• References to Qin have already been removed from the foreign ministry's website.

One month after he was last seen in public, Qin Gang was removed from his post as China's foreign minister. The news sent shockwaves around the world, but it came with no explanation — and experts say we may never get one.