Jing Jiu was rather happy, probably because he had possessed the sheath of the Inherited Heaven Sword; so he had made a rarely heard joke.
Normally, what he said wouldn't count as an interesting joke, but the standard of jokes for him should be considerably lower than others.
Ada wondered if Jing Jiu had thought he was some kind of dowager empress taking care of the state affairs behind the scenes, so he said something he thought it was funny and expected others to laugh at his gag.
Gu Qing somehow laughed out at it.
Ada thought it was preposterous, wondering why Gu Qing was willing to cooperate with his Master on such a ridiculous gag.
All of a sudden, Ada realized that Jing Jiu was to use Gu Qing like what he had done with the Grand Scholar Zhang.
Jing Jiu didn't tell others about what had happened in the Illusionary Realm of the Green Sky Mirror, but other participants of the Dao Competition didn't keep the secrets for him.