Here is the full translation of your text into English with proper grammar and flow:
Night had fallen, completely erasing the traces of dusk, when Reina, Yosan, Lia, and other members of the royal family arrived in front of the theater building. The grand structure stood elegantly in the heart of the city, adorned with crystal lights that shone softly. A long queue stretched at the entrance, indicating the popularity of tonight's performance.
As they stepped inside, they were greeted by the elegant atmosphere characteristic of the royal theater. The walls were adorned with intricate carvings and classic paintings, while luxurious chandeliers bathed the room in a golden glow. The place was lively, with guests from various backgrounds eagerly finding their seats.
Standing in front of the ticket booth, Elexon scanned the surroundings, observing the people entering the building as well as the busy staff rushing back and forth. "It's so crowded," he murmured.
The theater ticket clerk smiled warmly. "Indeed, sir. More people than usual have come tonight because they are eager to watch the play adapted from last year's famous novel."
"Novel?" Elexon frowned in confusion.
The ticket clerk blinked, as if he couldn't believe that the man before him was unaware of this information. "Sir, didn't you read our theater brochure?" he asked carefully.
Elexon chuckled at his own ignorance and scratched the back of his neck. "Sorry, I had no idea. I'm only here because my daughter was eager to watch this performance. I didn't pay much attention to the details."
The ticket clerk nodded, touched by Elexon's response. "You're a good father. I wish I had parents like you. Not many parents are willing to accompany their children just because of a request like that."
"Most of the people coming here are couples wanting to enjoy this romantic story together," he added, glancing at several couples entering the theater, looking excited about the upcoming show.
Then, jokingly, he continued, "Though, of course, there are also those who come alone or with their families, right?"
"Enjoying this story doesn't require experiencing love firsthand with a partner. In fact, this story will make people fall in love after watching it," he sighed, raising one hand with the palm facing upward, as if emphasizing the irresistible charm of the story.
Elexon smiled faintly and shook his head, not entirely understanding the mindset of the younger generation. After the brief conversation, he proceeded to register the names of his family members and guards. To maintain their anonymity, they used aliases to avoid drawing attention or being recognized.
"It would probably be much better to watch from an exclusive section," Elexon remarked, noticing the increasing number of people arriving. He thought that an exclusive area would be more advantageous and comfortable, providing a better view and more freedom of movement.
However, upon hearing his request, the ticket clerk flinched slightly, looking a bit guilty. "I'm sorry, sir, but the exclusive seats are already fully booked," he said, briefly showing the guest list. The names listed were from noble and high-ranking officials of the Lumina Kingdom, such as Marquesses, Viscounts, Earls, Barons, and other esteemed figures.
Reina, who had been admiring the grand theater, turned when she heard the conversation. "There's no need to choose the exclusive section, Uncle," she said calmly. "I just want to sit in the regular seats and blend in with the crowd. Besides, I don't want to stand out."
"But, Rein—" Elexon started to protest.
"It's fine, Uncle," Reina interrupted with a wry smile. She was still reluctant to interact with him too much and had not yet forgiven the man.
Even so, tonight, Reina just wanted to enjoy the performance peacefully, without any awkwardness or formalities, like an ordinary person. To achieve that, she had to be careful about her identity and, of course, avoid standing out in the crowd. For that reason, she decided it wouldn't hurt to speak with Elexon for a while.
The ticket clerk, who had been observing their conversation, frowned in confusion. "Blend in and not stand out?" he thought, wondering what was really going on.
Elexon sighed in resignation and proceeded to pay for the tickets after completing the registration, which was then confirmed. The ticket clerk then asked one of the staff members to escort Reina and her family. As they walked, the stage became increasingly visible.
Lia, who had never watched a live performance before, looked excited. She held Yosan's and Reina's hands alternately, her eyes sparkling as she took in the magnificent stage with its still-drawn red curtains.
"This is Lia's first time at the theater!" Lia exclaimed enthusiastically.
Reina smiled and patted her daughter's head. "I'm sure you'll love it. Theater can transport us to another world with just a story and the actors' performances."
"And most importantly, the male actors in this play are all very handsome!" Reina added excitedly, swinging her legs happily. Her eyes sparkled with delight.
"Whoa, that sounds fun! Are they more handsome than Dad?" Lia asked curiously.
Reina shook her head. "Even though the male actors are handsome, their looks can never surpass your father's!"
Upon hearing this, everyone around them rolled their eyes at Reina's usual reaction whenever she saw or talked about handsome men.
"I'm starting to doubt whether you truly love me unconditionally if you say things like that," Yosan remarked, staring at Reina flatly.
"No! Wait! That's not what I meant! I really do love you sincerely, without any conditions!" Reina exclaimed in panic.
"Never mind, you don't have to say anything more," Yosan replied, turning his head away in apparent irritation. However, a few seconds later, a small smile appeared on his lips—he was secretly enjoying Reina's flustered reaction.
"Yosan… I really do love you sincerely!" Reina clung to Yosan's arm, trying to get his attention, feeling guilty for praising other men in front of him. She hadn't expected him to react this way, as he usually seemed indifferent whenever she admired someone else.
"If you don't believe me, I can prove it with—"
"Enough. I was just joking, Your Majesty. I believe what you said," Yosan interrupted before placing a quick kiss on Reina's lips—right as Lia suddenly ran off somewhere, not wanting to listen to her parents' debate any longer!
Reina's face immediately turned red, and her cheeks puffed out in annoyance.
"Annoying," she grumbled, lightly punching Yosan's arm before focusing on the stage.
Meanwhile, Yosan simply chuckled, having successfully teased Reina. On the other side, Elexon, who had been approached by his granddaughter, lifted Lia into his arms while conversing with his wife and observing the surroundings. Nils, Harzel, Beile, and several accompanying guards were enjoying some light snacks they had received after purchasing tickets, accompanied by refreshing drinks.
Soon, an elderly man in an elegant robe stepped onto the stage, holding a finely carved wooden staff. He was the host, tasked with providing some background on tonight's performance.
"Tonight, we will witness a play adapted from last year's popular romance novel, Love That Came at Almost the End—a touching love story about a man who, albeit late, is given a chance by fate to be with the woman he loves," the elderly man announced in a powerful voice.
The audience murmured excitedly, eager to see the story unfold.
Then, the lights dimmed, and the red curtain slowly rose. Soft music began to play, drawing the audience into another world.
The story began. Scene by scene unfolded, accompanied by beautiful singing that left the audience in awe. However, for Yosan, it stirred a deep sense of confusion and curiosity. Why did the story feel so familiar? It was as if he had experienced it himself in the past.
Especially when the male lead lost in battle, only to be saved by the female lead, who later became obsessively, madly in love with him—just like Reina had once been with him.
"Your Majesty, doesn't this story seem strangely familiar?" Yosan asked Reina, who was watching the play intently.
"Familiar? In what way?" Reina replied without looking at him.
"Ah, never mind. Forget it. It's probably just my imagination," Yosan said, choosing not to pursue the thought further after seeing how engrossed Reina was.
"Perhaps," Reina nodded.