@Oylesine Go check the flashback again. He's the only one who saw the voicemail notification as Choi had left the room before he went in.
Moonyoung's still an asshole for what he did, but man, the glasses kid doing everything on a fucking whim is just... wow. And he didn't think anything really bad would happen because of it to boot. Kid deserved to have his face pounded into the lockers as painfully as possible.