I wrote this after having listen to BTS's Interlude from the Dark&Wild album.

Tossing the blazer over his desk, the tired male then snatches up his receiver and dials in a number before fixing himself on a spot by the window.

The dial tone rings and rings. His eyes idly take in the view the window looks over and doesn’t really scrutinize the view into great detail. He’s about to, if not for the sound of her voice suddenly gracing his ears in a soft murmur.

“Hello?”

“Hey,” he replied just as lazily, but the smile on his lips contradicts his tone.

A pause and he senses the smile in her voice as she reciprocates, “Hey.”

“So what are you doing right now?”

She tells him she’s not doing much. She adds on to her answer on what she actually should be doing, which was an assignment due in a few days. He chuckles at her whines but doesn’t belittle it. He understands. He’s been there. She then proceeds to ramble on her activities for the past week and what she expects to come the following week. He smiles all the way, relishing the way her pitch would raise whenever she’s excited or the way it slurs whenever she pouts as she speaks. He doesn’t interfere. Only when needed, with hums and short comments when asked for one.

“So when will you be back?”

The question makes his chest tighten as it constricts his heart.

“Soon,” is all that he answers her with.

“Okay,” she accepts.

The door to his room opens and he looks over his shoulder just as slightly to show them he’s giving them his attention.

“We’re ready.”

That’s enough of an indication that he needed to go.

“You’re needed,” she states, disappointed.

“Yeah,” he simply answers.

Silence.

“Goodnight,” he wishes, breaking their silence.

“Goodnight.”

He counts to five.

“I love you.”

She whispers just as endearingly, “Love you too.”

The dial tone reappears and his fingers stay gripped on the electronic device for a number of moments before pulling it away – reluctantly – from his ear.

I imagined Tae Hyung as the male persona.
But it's okay if you pictured someone else. 
The persona's already nameless. 

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Also, since we're already on song-inspired/based drabbles... 

“I’m so sick~” his pink-haired friend mimics as she balances herself atop the train tracks.

The hooded male chuckles and sings his own favoured part, “Reject rejection…
I was always too much~”

She continues, “Everyone follow me~”

“SICK! SICK! I’m kinda SICK~!”

The two friends burst into a soundless dance, humming their own rendition of the saxophone melody out of their lips and laugh it out once realising their own ridiculousness.

Calming down, she asks teasingly, “So how do you find it, good boy? Still think it was a bad idea?”

He blushes.

A distance has been travelled, before he answers contentedly, “Nah.”

She nudges him.

“Told ya BTS was dope.” 

oh, they know they are. ;)
btw, the second drabble's an excerpt of a longer piece. not sure if i should post it up as a o/s yet or not
also... i've come to realise that i do a lot of dialogues for drabbles
sorrynotsorry if this bores you