Discovered
After returning to Chiang Rai, he didn't see Li Xuan and Worm Dugu. Presumably, the two of them had yet to return from the Ice Silkworm Gu King's place.
Gu Shanshui wanted to think of a way to get a container to rear the Corpse Bug. Therefore, he returned to Mong Hsat overnight.
Zhou Wen didn't follow Gu Shanshui to Mong Hsat. He decided to get the calabash back at Mong Hsat in a few days.
He chose to stay because he wanted to visit the Xiao family and figure out the matter between Xiao Si and Wang Chan.
Li Mobai also planned on staying in Chiang Rai for a few more days before heading off with Zhou Wen to Mong Hsat.
That night, Zhou Wen used the Invisibility Cloak and headed for the Xiao family. He planned on infiltrating the family to see if he could find out anything.