
I haven't read the book, but did the Arbiter on purpose leave out his diary? I think he knows that An is a mushroom and took the spore from him ... so tested him with the diary.

He doesn’t know, but he does suspect him. The webtoon has given Lu Feng some soft qualities in comparison to the novels. He is a man with the strongest sense of duty as an arbiter- someone the general public absolutely loathes and he fulfills his job with a cold-blooded demeanor for the most part. By this point, if he knew An Zhe was a mushroom, he would've killed him for being a xenogeneic.
jian wasn't even embarrassed in the car during the petting .. let is say ...he was fucked on the bar stool in front of everyone before... So he is not a shy person.
Wait when did that happen?
Go hajoon fucked him Infront of the whole bar in (ch 18?)
Holy shit how did I forget that maybe I blocked it out cause I hate the long hair blond guy. So annoying
In that bar everybody gets fcked publicly lol And he aslo had the same drug that Mieum got, so he knows how it is (remember when Jitae and Hajoon were in the bar talking, and Jian appeared full horny, wanting to have sex with anyone (first Hajoon, then secretary Jin)