Su Pan'er turned around and walked back, recalling the special object mentioned by the Qin family as she went.
"According to Lord Su's original statement, the object should be a strip, neither gold nor silver, thin as a cicada's wing, with no apparent use. In order to create a substitute, my Qin family tried everything, and finally managed to produce a replacement which was handed over to Lord Su..."
That strip, neither gold nor silver, thin as a cicada's wing, unexpectedly reminded Su Pan'er of the key she had found in the underground passage of the Qin Family's ancestral hall!
That key, thin as a cicada's wing and neither gold nor silver, that could open the underground passage!
Assuming Su Ke had indeed discovered something and then approached the Qin family to create a substitute to open the passage, then...
Su Pan'er slowly stopped walking as various thoughts surfaced in her mind.