C468 Mischief

Lau Hsingchan saw how her sister was looking around and thought to herself, "Sister must be sad to see Eldest Senior Brother being so considerate to that bitch and to let my sister be sad, so I'll show you some face."

Lau Hsingchan sprinkled some unknown powder on the ground. After a while, Lau Yuechan heard a hissing sound.

What Lau Hsingchan learned was the Gu of poison arts