@FredFriendly
I don't know, I think he's more oblivious than her because in chapter 35 it became clear that he hasn't even realized that he likes her more than just a friend yet (he googled why his heart was racing after she teased him a little lol)
Besides that, shouldn't he be more aware of the signs that a girl likes him considering that he's really popular with girls? In the very 1st chapter there was some random girl confessing to him and Su Ye's first thought was "So annoying, how many is this now?", which suggests that he's been rejecting girls for some time.
On the other hand, she has always been socially awkward and isolated, so her obliviousness isn't as surprising.