Here is the corrected version of your text with improved grammar and flow, while maintaining its original tone and structure:
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In a dark alleyway, two young men, around the ages of 17 to 18, stood together.
One had black eyes, as deep as the abyss, and hair that matched, while the other had silver hair and gleaming silver eyes that shone brightly in the darkness.
The young man with silver hair asked, "I think it's about time we head to the police station, Sunny."
"Yeah, you're right. Let's go, Dawn, before it's too late."
"Dude, you have to stop with the 'my life is over' attitude. It's not over yet, dumbass. All we need to do is survive. If we can do that, then it's easy."
"Oh, spare me the rant, Dawn. If anything, you should be saving your energy."
As we continued heading toward the nearest police station, I nodded silently, knowing that he was right.
When we arrived, we calmly opened the doors of the police station.
The first thing we saw upon entering was a fat, obese, and very unpleasant-looking policeman who glared at us with disdain.
He said, "Listen, if you've lost your parents or something like that, we don't have time to deal with that shit," his voice dripping with complete disregard.
We laughed slightly, and Dawn replied, "Quite the opposite. Under the Third Special Directive, we are here to hand ourselves over to the authorities as carriers of the Nightmare Spell."
The policeman's expression changed in an instant—the greatest double-take I had ever witnessed. He went from absolute disregard to serious and fearful in a matter of seconds, making me question whether he was bipolar.
The policeman screamed, "Two Code Blacks! In the lobby! Two Code Blacks in the lobby!"
Sunny and I were quickly taken away to two separate cell rooms facing each other.
Suddenly, an old man, who looked as if he had seen far too much in his lifetime, spoke to us.
"Listen up," he said. "I can tell the both of you don't have much time, judging by how hard you're trying to keep your eyes open, so I'll make this quick.
"When you get there, check your runes. That is the most important thing. Then your surroundings, and finally, try to figure out your situation within the Nightmare. That's all I can really say. Good luck. Don't die on us, Aspirant Sunless and Aspirant Dawning."
Sadly, Sunny couldn't hear the final words of the officer, as he had already drifted off to sleep. Luckily, I did hear them. Nonetheless, a second later, I, too, fell asleep.
As I drifted off, I felt my body change deep within—something within my soul—but at the same time, I felt enamored by something far beyond my comprehension. I realized: this is the spell.
I opened my eyes and found myself inside a strange white marble temple, like something from the ancient ruins of Greece.
Inside the temple walls, there were carvings of a man embracing what seemed to be the sun. Then, that man confronted another figure who appeared to embrace darkness. Finally, the man was shown falling like a shooting star. It was oddly sad and beautiful in its own way.
Dawning, deciding to get straight to business, screamed out, "Status!" like in all the webtoons he had read as a child.
Surprisingly, even to himself, a screen of red runes appeared before him. For some reason, he understood the runes. The screen displayed:
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Name: Dawning
True Name: -
Rank: Aspirant
Soul Core: Dormant
Memories: -
Echoes: -
Attributes: [Destined], [Child of the Sun], [Flames of Divinity]
Aspect: Sun God's Worshipper
Aspect Description: [You are the Sun God's last worshipper]
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"Okay, so at least the spell didn't completely mess me up. But what the hell do 'Destined' or 'Flames of Divinity' even do? I guess I'll find out at the end of the Nightmare. Still, I wonder how Sunny is doing."
As he thought this, a slave in shackles suddenly sneezed and muttered, "It's that bastard again. He should focus on his own Nightmare."
"Eh, he'll be fine, hopefully," I thought to myself.
Suddenly, I heard a knock at the temple doors. Cautiously and curiously, I crept silently behind the door and asked, "Who is it?"
"It's me, Elder Ryan, from the village."
"I see. You may enter," I said, slowly backing away from the door.
"My lord, I am here to report even more deaths."
Trying to play along with the situation, I looked at the man with a worried expression and asked, "What happened?"
"It was the Moon Crawler again. It demanded even more sacrifices this time than usual. Since none of the Nine have responded to our call, we really have no choice but to follow its demands. My lord, you are the last worshipper of the Sun God. Surely, you are capable of doing something, no?"
Unlike others, I sadly lacked real power or physical strength to help against what I imagined to be a fearsome beast.
"Besides, how strong even is this Nightmare?" I asked.
"You see, my lord, if I am correct, it seems to be an Awakened Tyrant."
"Sorry, what?!"
"I know. My reaction was quite the same. But, my lord, you must be capable of doing something, right?"
"Head back to your village. I'll see what I can do," I said, my voice filled with clear and understandable worry.
"I see, my lord. Thank you. Good night."
"Good night, Elder Ryan," I said as I closed the temple doors.
"This is crazy. An Awakened Tyrant?! This is absurd, ridiculous. Hell, Spell, aren't you supposed to be fair in your own cruel way? How is this fair?
"Haha, how infuriating. Anyway, it's best I calm down. Anger will help no one.
"Okay, let's gather our thoughts and see where we stand. I am a lord—or at least a high figure in some region. I am seen as the last worshipper of the Sun God. Apparently, that title holds some power. Hopefully, I can use it to my advantage and escape somehow. I seemingly need to defeat an Awakened Tyrant?
"I swear, Spell, if you don't give me a True Name or some cool aspect at the end of this Nightmare, I will make you regret ever creating it."