
Well I'm not sure about this but it could be due to MC's state of deteriorating mind, which could be the sude effect of the sus medicine that they're feeding him, his parents also noticed that too. When he went to his prof's apartment for the first time, I think he was just being careless because he thinks that being a beta, he won’t be able to sense pheromones and won’t be in danger but when he finally got inside, he became skeptical and disturbed about his professor's behavior

Yep and notice how he already questioning what everyone says about that he's usually not, his routine change, behavioral change, and he's like stares into nothing. Tho going to his prof's house instead of his parents are a bad choice cuz I would go to my mom and dad when something goes wrong, definitely wooju's brain is something else
MC has loving parents why he's in the creep's home. Ml and second lead are toxic and can't be trusted. Does he not has a gut feeling something is wrong on the professor that's why he should stay with his parents