Xia ruofei had already learned from master Yuntai that one of the mysterious characteristics of the rising Dragon Token was that it would disappear mysteriously every three hundred years or so, and then reappear in every corner of the cultivation world after fifty years or so.
These three hundred years or so were not a clear time. Sometimes, the token would disappear after three hundred years, and sometimes it would be slightly longer.
Xia ruofei could judge that the token had been in the spirit map space for at least three hundred years based on the age of the previous owner, immortal mountain river. In other words, according to the rules of the past, the token could disappear at any time. Hence, when he knew about this characteristic, he had always felt a sense of urgency.
This was the main reason why Xia ruofei was willing to take the risk and reveal that he had the last token. He was also actively pushing for the secret research of the token.