The last few episodes of The On1y One emphasized the casual public and private intimacy between Tian Yang and Shi Yu because they were more relaxed around each other since there was nothing queer happening between them. They were just two boys sleeping in a bed.
Compared to Wang and Tian who were restrained laying next to each other because they knew their feelings and what it would mean to touch each other.
Because even when they did touch in bed, it was nowhere near the entanglement of limbs that their roommates demonstrated. There was still a sense of self-control.
So because Wang and Tian know, they didn't touch each other like when Wang immediately pulled his hand from Tian even though he did need help walking. It was realizing his feelings, so he didn't want any touch to be publicly perceived as a gay touch.
Which is something that didn't happened between the other boys. So what if someone saw them touch? It wasn't gay. It was just a touch.
And we saw it again.
And again.
Knowing caused a barrier between the boys.
Because that barrier didn't exist with anyone else.
In the end, knowing was the problem.