Although it was just a slight panic, in Xiao Lin's eyes, it was as obvious as a pile of black cow dung in a field of white snow.
Alright, maybe this metaphor is a bit inappropriate, but you get the idea.
In short, Xiao Lin noticed Luo Qingyan's panic.
However, he didn't feel any pity; instead, he thought Luo Qingyan deserved to be panicked.
