편지 : 언젠가 닿을 마음들

✒️ Creator's Comment

This is my first creation, so there are many shortcomings. 🙇

I made this because I enjoy genres like drama, human drama, and ensemble dramas.

I focused on hearing the stories of various NPCs rather than the user character (PC) as much as possible, and recording their lives in the form of letters. Of course, if you find an NPC you like during gameplay, you can set them as a fixed NPC and continue your relationship and narrative.
(During testing, I felt sorry for a helpless child and brought them in as an assistant 🥹)

Due to the nature of the genre, even with Gemini 2.5 Pro and positive bias turned off, the overall atmosphere remained calm and lyrical.

- Positive Bias OFF: Mystery or conflict-focused stories
- Positive Bias Normal: Touching or calm human dramas
If the story feels too biased, I recommend changing the positive bias level.

Even with instructions, it seems to be an issue with the AI's inherent tendencies, especially with Gemini... 🥲
Alternatively, you can switch to the Opus series for a change of pace.

⚠️ Due to the large token count, using advanced models is recommended.
⚠️ The creator widget includes an item to reinforce the AI's memory, so please use the widget function if possible!

📌 Tested Models

Gemini 2.5 Pro (Positive Bias OFF/Normal)
Gemini 3.1 Pro (Positive Bias OFF)
Gemini 3.5 Flash (Positive Bias OFF)

Claude Opus Series: HTML is cut off, so you need to input 'Continue outputting the letter' in the next turn to see it. 😭
Recommended for use outside of letter writing/replying.

GPT-5.4: Command execution and HTML output verification. More stable output than Opus and Sonnet.

GLM 5: Command execution and HTML output verification. However, the output volume may not be guaranteed.

Low-cost models (General models)
- DeepSeek: HTML output is not very good. Command execution is about 50/50. Strongest for RP among the three general models.
- Donald 2: Most stable HTML output. Commands are so-so. Stronger for RP than Huey.
- Huey: HTML is slightly unstable, but commands are executed best. Not recommended for RP.

General models can be used without major issues, but they sometimes omit items from the creator widget's request section, so advanced models are recommended. Sonnet series is not recommended.

📌 Model Usage Tips

I personally do not recommend using 3.5 Flash alone. It's better to use it as a supporting model mixed with others for NPC Q&A or daily scenes.

📌 Command Usage Tips

!output / !put: Use when the output volume decreases. It's recommended to set the impersonation level to normal and maintain it for only 1-2 turns.

!check / !check: Using this before catching user impersonation can improve its effectiveness.

!stable / !stable: Write this at the very top before sending your prompt. It catches user impersonation.

!summary / !sum: Briefly summarizes the conversation so far in chronological order. Pasting the summary into the user note or the auto-summary's long-term memory is helpful for reinforcing the AI's memory during long RP sessions.

If the turn count gets too long, the AI might suddenly deviate from the genre or intensify user impersonation. If you notice signs of user impersonation, use the check and stable commands immediately.

If commands are not being followed well, use the reroll command with:
['Must execute 'command name'.]

📌 Play Tips

The PC persona is not fixed beyond the profession of a scribe! I also tested without defining the PC's status. Even a commoner who learned to write by observing others would be fine. 😎

I considered adding a currency system, but I decided against it because I believe the main focus of this simulation is observing the stories of various characters rather than earning money. However, if you want to play a debt repayment scenario, you might consider adding a currency item to the widget.

Example of Fixed NPC User Note
Fixed NPC
• Marcus: A young man, works at the post office near the office, friendly with the PC. Kind personality.
• Mary: A middle-aged woman, owner of a fabric store. Recently came to the office to commission a letter-writing service and adopted the cat being cared for at the office.

📌 Request Adjustment Tips

Since both NPCs and requests are random, if an unwanted request appears during gameplay, enter the following in OOC: [Cancel the current request. Do not generate the same type of request in the future.]

Also, if there are requests you 'only want to receive' or 'do not want to receive', you can write them in your User Notes.

If you want to deviate from letter requests, enter the following OOC in your prompt.
[OOC: Return to the basic structure of the simulation (operating the office and receiving various clients).]

🧪 Test Environment

I primarily played with Gemini 2.5 Pro, Positive Bias OFF + Impersonation OFF. I used auto-summary as a default command and the summary command every 30-50 turns. Character status was turned off.

✉️ Closing

I created this because I was tired of user-centric chat. I wanted the PC to be an observer of events as much as possible, like Ok-hee in 'Love Guest and Mother,' but ultimately, once fixed NPCs were added, it ceased to be a simulation of just exchanging letters. Having an assistant, a lover... I suppose that's also a way to enjoy this simulation. ☺️

I wanted to capture the essence of handwritten letters, the pinnacle of analog, within AI chat, a product of the digital age. I hope it has been conveyed well. 🥲

During about 300 turns of testing, I had a lot of fun playing through touching and sad stories, as well as explosive anger or completely unreasonable clients. I sincerely hope this simulation provides you with enjoyable memories as well. 🥰

🎵 Recommended Song

https://youtu.be/qrkCW7GZhlo?si=01_3kULM5M-XLxTF

🎵 Recommended Song (For mobile app users/copy and paste into address bar): https://youtu.be/qrkCW7GZhlo?si=01_3kULM5M-XLxTF

📜 Creator Widget Share: https://caveduck.io/widgets/share/5d91e0dd-2f8d-4153-8b88-ba447e11bdde

If you wish to add extra items, copy this widget as a user widget, add your items, and use it! You can also change the design. I'm sharing it because the 'Letter Request/Reply Archive' item is useful. If you use a user widget, you can disable the creator widget.

🏷 Using GPT-5.4 for the first 2-3 turns seems to result in longer output. Gemini series is recommended as the base, and you can mix and match according to your preference.

🎁 After the introductory output is complete, please go to the beginning of the text! A small new feature has been added this time. → This update allows you to check it directly in the episode preview!

I tried the recommended persona feature, and it seems to generate quite well. I left the gender selection as unselected and uploaded an example.

[Basic Information]
Gender: Female
Age: 26
Appearance: Neat short black hair, calm and deep-set brown eyes, clear and transparent skin tone, 163cm tall with a neat and upright posture.
Attire: Neat shirt with sleeves rolled up to avoid ink stains, comfortable cotton pants, often wears an apron.

[Personality/Traits]
Personality: Calm and cautious, listens attentively to others, stable emotions with little fluctuation, sophisticated with appropriate distance.
Traits/Abilities: Very neat and beautiful handwriting, empathetic ability to read and articulate clients' emotions into words, strict confidentiality regarding clients' secrets.
Habits/Speech: Habit of lightly touching the tip of her fountain pen to her chin when lost in thought, answers calmly and politely after listening to the other person completely.
Origin/Status: Ordinary citizen of the empire, grew up surrounded by books from a young age, showing talent in writing.
Occupation/Affiliation/Position: Scribe, runs a small scribing office on the outskirts of the city.

[Preferences]
Likes: The texture of well-dried parchment, warm black tea freshly brewed, the quiet air of dawn, the sense of accomplishment when a carefully written letter is delivered.
Dislikes: Humid weather that causes ink to smudge, requests containing baseless slander, rude behavior that pries into others' private lives.

[Other]
Office Management Philosophy: Prioritize recording the client's true feelings, focus on conveying their emotions without judgment.

If you have any questions or wish to report errors, please leave a comment. I will respond, though it may take time. Thank you. 🥰

Letter: Hearts That Will Someday Reach

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