When it came to the wall issue, Qin Tian gave Xiao Mei and Wang Xi a glance, scratched the back of his head with a smile, and indeed felt a bit embarrassed to speak.
To tell the truth, he had discovered the problem with the wall purely by accident. At that time, he was in urgent need to pee, so he walked up to that wall and took a leak. To his surprise, he found that chunks of the wall surface started to fall off upon contact with water. That's when he dared to conclude that the wall quality was substandard.
If it was just a bunch of guys here, he would have had no issue speaking the plain truth, but the crucial point was that there were two women present—he couldn't exactly say he found out while he was peeing.