When Kyung notices, it’s in the way Zico laughs and lightly teases Taeil for a few mistakes made during recording, rather than getting grumpier because it means they have to re-record those parts.

When Ukwon notices, it’s Taeil leaning against Zico on the couch while they all watch a movie, and Zico trying to fight back a laugh at something Taeil had whispered into his ear, their fingers dancing together, mostly hidden between them.

When Jihoon “notices”, Zico and Taeil have excused themselves from a group outing to go off on their own, and he was about to invite himself along—it was less him noticing, really, and more the other four telling him not to intrude on other people’s dates.