After Feng Xiangxiang was forced to resign, he started a live broadcast to dig for treasures. He dug up a national jade seal worth three million. Former boss Li Honglei, however, pointed out that Feng Xiangxiang's treasure-digging behavior was illegal on the grounds that Feng Xiangxiang's resignation report had not been approved. As long as he reported it to the relevant departments, Feng Xiangxiang's jade seal worth three million would be confiscated by the state. It was confiscated for free and he couldn't get a penny. Later, Li Honglei falsely offered a cabbage price of 20,000 yuan to buy Feng Xiangxiang's jade seal. How should Feng Xiangxiang keep his wealth and kill his former boss?