On a warm and sunny spring day.

"That will be all for today, my lady."

"Thank you for your hard work."

The young noble, who had just turned six, showed an unexpected level of politeness as he sent off the young official.

Once alone, he stretched his legs and let out a curse.

"Damn... I'm exhausted."

Rubbing his numb legs from kneeling, he turned his head to look out the window.

The blue sky came into view over the layers of tiled roofs.

The young noble sighed as he gazed at the sky.

"Ah~. Being born a prince is nice, but... why did it have to be as the crown prince, and with a father like King Sejong...?"

He sighed deeply once more.

"Why does it feel so bad even though I was reborn?"

The child, who spoke the unbelievable word "reborn," was Jin-ho, who had returned to life as Lee Hyang, the firstborn son of King Sejong, who would later become King Munjong.

When he first opened his eyes, Jin-ho thought he was in a temporary treatment facility set up at the scene.

The first thing he saw was the rafters above him.

"Whose tiled house is this in our neighborhood...?"

As he pondered whose house he was staying in, Jin-ho soon realized another problem.

"Why is this room so big? And why does it feel so cramped? Could it be a full-body cast?"

With all his strength, Jin-ho turned his head.

Then he realized his body was wrapped tightly in swaddling clothes, and that it was smaller than he had expected.

"Ah?"

Caught off guard by the unexpected situation, Jin-ho involuntarily exclaimed.

At that moment, a woman's voice came from somewhere his gaze had not yet reached.

"My lady! The young master has opened his eyes!"

It took Jin-ho three days to fully comprehend that he had been reborn as a baby.

Still wrapped in swaddling clothes, he spent his days eating, sleeping, and soiling himself, all while counting the rafters above him.

However, his mind was tirelessly working to find answers.

"I am definitely reborn... but where is this? It looks like Joseon..."

Jin-ho could not be sure where this new life would take him.

He could not understand the language spoken around him.

"Is this another world that looks just like Joseon? How interesting..."

Amidst the confusion, Jin-ho eventually began to understand the language after about three months, allowing him to gain some certainty.

"This is indeed Joseon! What kind of nonsense is this...?"

Without considering the passage of over 500 years, Jin-ho found himself blaming the strange language.

His actions to confirm the situation led to misunderstandings with his parents.

"My lord, it seems our child is not an ordinary talent."

"Did you feel the same, my lady? I feel the same way."

"I am worried about that."

"I feel the same."

As their conviction deepened that their child was not ordinary, the couple's worries grew.

"A royal family, huh? A royal family..."

Unaware of his parents' deepening concerns about him, Jin-ho was sorting out the first situation.

1. His father is of royal blood.

2. The place he currently resides is Gaeseong.

The capital of Joseon is Hanyang.

Conclusion 1. Combining 1 and 2, his current father is far from the throne.

3. From the voices of the servants outside and his parents' attire, they possess considerable wealth.

4. According to what he previously knew, royals consciously distanced themselves from learning for survival.

Conclusion 2. He need not worry about food and living, he won't have to bow to anyone, and minimal study will suffice.

5. Based on the information he has gathered, he is the firstborn son.

Within the family, he will not be overshadowed.

6. He retains the knowledge he remembered from his past life.

7. After growing up to a certain extent, any actions he takes based on his past life memories will be seen as eccentric behavior for a royal with nothing to do.

Final conclusion.

Awesome! This is sweet!

Confirming his conclusions, Jin-ho smiled brightly.

"Given the situation, studying the Thousand Character Classic and minimal learning should be enough... If it's after King Sejong, then the Hunminjeongeum must have been introduced, so I can study that. By that time, Westerners would have come to China, so if I can get a few translated books, I can cover my tracks! This is sweet!"

Dreaming of a rosy future, Jin-ho smiled brightly, prompting his nurse and mother to exchange cheerful words.

"Oh my, my lady! The young master is smiling!"

"Is that so? What could be making him so happy?"

Holding Jin-ho, who was wrapped in swaddling clothes, his mother looked around.

Amidst the usual scenery, the voice of her husband reading could be heard.

Thinking that her child smiled upon hearing his father's voice, she gently patted his head.

"Seeing him enjoy the sound of reading already, our child must have great literary talent."

It was a fatal misunderstanding.

Meanwhile, Jin-ho was diligently assessing the situation and altering his scenario.

"First, let's look at my parents..."

When he first saw the faces of his mother, whose swelling from childbirth had subsided, and his father, Jin-ho's impression was simple.

"A child has given birth to a child."

In the 21st century, this would have caused a stir among both families, but in the Joseon era, where early marriages were common, it was somewhat understandable.

"Moreover, being the firstborn son makes sense, but the problem is their attire."

Jin-ho tilted his head slightly as he observed the clothing worn by his parents.

"From the dramas I watched in my past life, it looks like it's from the early Joseon period. Even if I stretch it back, it could be during the reigns of Taejong or Sejo... or perhaps Yeonsangun? If it's during Yeonsangun's era, that would be quite troublesome."

As Jin-ho pondered when he had been born, an even more troublesome event unfolded.

After safely passing the thirty-day and hundred-day milestones, as his first birthday approached, his maternal relatives began to visit frequently.

One day, his grandmother asked his mother in a hushed voice after sending the nurse and maid outside.

"Does the Grand Prince still keep close to his books these days?"

"As always, he is deeply engrossed in learning."

Proudly answering her grandmother's question, Jin-ho's mother was met with a firm grip on her hand as her grandmother continued.

"Recently, there has been much talk about the Crown Prince's erratic behavior. Because of that, there are various rumors surrounding the Grand Prince. Your father is beginning to take some action, so both the Grand Prince and the military lady should exercise caution."

Jin-ho's mother was taken aback by her grandmother's words.

"Oh my! What a shocking thing to say!"

"Do not speak of this to anyone, and be cautious."

The one startled by her grandmother's words was not just Jin-ho's mother.

"What is this about? Are they suggesting replacing the Crown Prince? Who was the king who replaced the Crown Prince in the middle?"

Lying on the bed, Jin-ho desperately racked his brain.

"The successful replacement was King Sejong, but how many were almost replaced?"

Frowning as he searched his memories, he thought, "There are too many variables!"

There had been numerous disputes over the Crown Prince's qualifications in Joseon's history.

Cases where the issue of replacing the Crown Prince had come to light were not few, and those that had drifted away without resolution were completely untraceable.

"My Hyang, are you feeling unwell? Did you go?"

Seeing the frowning face of the baby, his mother hurriedly checked his diaper and fussed around.

"Oh my! I will pretend I did not hear today's conversation. Please do not speak of it again."

"... Understood."

"I will not see you out."

With her mother's firm demeanor, Jin-ho's grandmother quietly left the room.

Turning her back while keeping an eye on Jin-ho, his mother sighed deeply.

"Ah~."

'Will I become a servant right after this birthday?'

Worrying about his future, Jin-ho learned during his first birthday celebration who he was and whose child he had been born as.

"Congratulations!"

"Thank you."

On the day of Jin-ho's first birthday celebration, people dressed in splendid silk garments flocked in to offer their congratulations.

With each guest that arrived, Jin-ho's father diligently returned their greetings.

'My father, the nobleman, seems to be quite a prominent figure.

Does that make things even more dangerous?'

As he observed the guests, Jin-ho found himself in a dilemma about whether to be happy or not.

'If I make a wrong bet, it could lead to disaster...'

"Why does our Hyang look so unhappy on such a good day?"

Seeing Jin-ho's frown, his mother picked him up and placed her hand on his bottom.

"He hasn't wet himself... What could be bothering our Hyang?"

With his mother's words, Jin-ho let out a small sigh.

'Putting everything else aside, I have to live as Hyang from now on.'

Still occasionally confused about whether he was Jin-ho, he finally reached a conclusion.

'From now on, I will live as Hyang with the memories of Jin-ho.'

The moment Jin-ho, or rather Hyang, decided on his identity, the most important person made his appearance.

"Haha! Chungnyeong! Congratulations! Sister-in-law! Congratulations!"

"Congratulations, sister-in-law."

As two young men in their mid-twenties appeared, everyone who had arrived earlier stood up.

"Welcome, Your Highness the Crown Prince."

"Welcome, Your Highness the Grand Prince."

Seeing the respectful greetings from those present, one of the young men raised his hand in response.

"Ah~. Nice to meet you."

With his robe fluttering, the young man approached Hyang's mother.

"Sister-in-law, may I hold our nephew?"

"It would be an honor, Your Highness the Crown Prince."

Receiving Hyang from his mother, the Crown Prince gently cradled him and looked at his face.

'Smile! Smile!'

As the Crown Prince held him, Hyang made a desperate effort to smile.

Seeing Hyang's smile, the Crown Prince laughed heartily and looked at Hyang's father.

"Hahaha! Chungnyeong! The child looks very bright, just like you!"

"Thank you, Your Highness the Crown Prince."

"Don't be too formal with your brother. That's your problem."

As always, the Crown Prince lightly chided his younger brother, who responded politely.

After returning Hyang to his mother, the Crown Prince took his seat, and the celebration resumed.

Meanwhile, Hyang was still in shock.

'Chungnyeong! My father is Grand Prince Chungnyeong? My father is King Sejong? Then I am Munjong, and my child will be Danjong?'

As Hyang struggled to come to terms with the shocking revelation, the celebration was now approaching the moment of the first birthday grab.

"Now! Let's see what our nephew will grab!"

At the Crown Prince's booming voice, several items were placed before Hyang.

With all eyes on him, Hyang's gaze fell on the items laid out before him.

'Let's see.

A brush, rice, a gold nugget, jujubes, thread, and a wooden sword... not bad.'

As he pondered what to choose, Hyang's eyes fixed on one spot.

His gaze was drawn to the Crown Prince's ear.

More precisely, it was the earring hanging from the Crown Prince's ear.

'Is such craftsmanship possible in this era?'

Curiosity piqued, Hyang reached out toward the Crown Prince without realizing it.

"Ah!"

"Me?"

As soon as the Crown Prince held him, Hyang reached out and touched the earring.

"Earring?"

"Ah!"

As Hyang unexpectedly touched the item, those gathered at the celebration began to wonder how to interpret this action.