Jongwoo:

This makes him annoyed at his lousy job and determined to work hard so you won't ever have to wake up to that annoying alarm again.

He's tempted to not alert you of the missed alarm, but he knows he would be pissed if you didn't do that if this was him, so he wakes you up, informing your alarm isn't turned on. When you panic and begin rushing he just awkwardly stands to the side, like that stiff standing emoji pose 🧍. Before you leave he quickly wishes you luck, not specificying with what but get the sense he means both getting there on time and overall day.

Moonjo:

Will wake up to a ticklish feeling, then notice it's because of Moonjo's fingers grazing your skin, as if you are a delicate thing, watching you with fondness. Before you can speak he informs your alarm did not go off. He sees entertainment in panic so can expect he didn't wake you up right away but specially waited a bit longer so now you have to hurry to get ready and leave.

As you do he'll keep distracting you, enjoying your halt in rushing to go "What? Huh? Eh?" or annoyed warnings to him. Before you leaves he takes your arm, causing you to ask "what", to which he answers: "My kiss" so have to give a quick kiss or else he won't let go.

Junghwa:

Goes to inform you calmly of this so you don't panic nor get a shitty wake up experience as that can leave someone in a sour mood for a long while. 

As you rush to get dressed she prepares you a quick breakfast with a drink and readies anything else she can. Before you leave she hopes you'll at least remember to give a kiss. So while your day might start shitty hers starts great as you turn back from leaving to give a kiss then rush out.