One of the things that’s going on without being obvious, but is so good when you notice it, is Go Seung Tak. He seems to be a bit lazy/uncaring, laid back, and a bit dumb; but is actually very smart - which they point out at the beginning, but you keep forgetting, because of how he acts and the way others dismiss him. And then, suddenly, something happens where he reveals how smart and switched-on he is, and you realise he really does know what’s going on.
I just watched episode 4 (hiding the next bit, for those who haven’t watched that episode)
and that moment at the end, which they’ve been leading up to, where Go Seung Tak looks _right at Cha Young Min - ! Freakish, and so cool. Ya, he knew the whole time! They did that so well. Giving hints, and then - Bam!
He knows so much more than he lets on.