"Are there legal things to watch out for when running auto-reply in a Korean chatroom?"
Yes. This post is a general self-check reference, not legal advice. Consult a lawyer / KISA (Korea Internet & Security Agency) for specific cases. The four broad areas that operators should be aware of:
Quick decision tree, is your auto-reply legally safe?
A rapid decision flow operators can use to self-assess their setup. Each branch maps back to one of the four areas discussed below.
What this post is NOT
- Not legal advice: this is a self-check reference. Specific legal questions need a lawyer.
- As of May 2026: Korean ad / network law gets revised. Check law.go.kr directly for current text.
- Korean-chatroom operators: chatrooms with Telegram HQ elsewhere or non-Korean member majorities need separate review.
Area 1, automation disclosure (display ad law)
Operators are encouraged to disclose auto-reply use to members:
- Direct legal mandate: Korean Display Advertising Act doesn't directly mandate "AI auto-reply disclosure", but ad-content disclosure trends apply.
- Industry practice: state "operator X runs this room; some responses use an AI tool" in the pinned message / chatroom intro / new-member welcome.
- Risk if missed: not a direct law violation, but if disputes arise, lack of disclosure increases operator exposure.
For more on disclosure, see responding when AI replies get caught.
Area 2, promotional messages / Information & Communications Network Act
If auto-reply sends promotional messages, regulation kicks in:
- Network Act Article 50 (commercial info transmission limit): limits commercial messages without prior consent. Members joining voluntarily generally fall outside, but commercial messages still need explicit notice.
- Mandatory "AD" labeling: prefix commercial messages with "(광고)" / "ad" (Network Act Enforcement Decree 21).
- Opt-out instructions: commercial messages must include opt-out instructions.
- Penalties: up to KRW 30 million administrative fine per violation.
Operator auto-replies that count as "regular conversational responses" don't fall under this. If auto-reply is commercial (payment instructions / external product promotion), the rules apply.
Recommended:
- Keep payment / external promotion in the Telegram bot (@resonate_info_bot) - not in chatrooms
- Keep in-chatroom auto-reply as regular conversational range
Area 3, personal data (Personal Information Protection Act)
Auto-reply tools process member messages / personal info:
- PIPA Article 15 (collection and use): operator feeding member messages to an auto-reply tool = personal data processing. Risk is low if local processing + no external transmission.
- Replyer's processing: local LLM (on the operator's PC) generates responses; member messages don't leave the PC → zero external data leak.
- Cloud APIs (GPT / Claude): member messages travel to external LLM servers → may require processor delegation notice / consent.
- Sensitive data: if the chatroom touches member ID / financial / medical info, separate handling rules apply.
Recommended:
- Use local LLM (Replyer's default) - zero external transmission
- Optionally state "operator's auto-reply tool processes locally; member messages don't leave the PC" in chatroom intro
- Be cautious adopting auto-reply in chatrooms handling sensitive data
For local vs cloud comparison, see local LLM vs cloud API.
Area 4, Telegram ToS / MTProto operator responsibility
If auto-reply violates Telegram ToS:
- Operator on the hook: auto-reply runs on the operator's Telegram account (MTProto API). ToS violations risk operator account suspension / ban.
- Spam / promotional messages: Telegram ToS prohibits auto-spam. Hourly rate limits / night gating / persona constraints matter.
- Bot reports: if members report the operator as "bot", Telegram reviews. Disclosure + natural response tone reduces report risk.
For Telegram ban prevention, see Telegram account ban prevention.
Pre-incident checklist
□ Pinned message discloses auto-reply use
□ New-member welcome includes auto-reply disclosure
□ Using local LLM (extra steps if using external APIs)
□ Hourly response rate limit set (avoid spam suspicion)
□ Night gating set (preserves naturalness)
□ No commercial messages fired directly in chatroom (only via bot)
□ Member reports / disputes have an immediate response plan
□ Backup zips preserved (response history / persona prompt as evidence)
□ Chatroom intro / rules updated periodically
□ Operator timezone / vacation / vacation policy stated
Dispute response flow
The Mermaid diagram below maps the 5-step flow plus the artifacts (backup zip / persona history / policy update) you need at each stage.
flowchart TD
E[Dispute event
member / external / report] --> S1[Step 1, freeze auto-reply]
S1 --> S2[Step 2, fact-find + preserve evidence]
S2 --> A1[/Download backup zip/]
S2 --> A2[/Preserve persona history/]
S2 --> S3[Step 3, 1:1 response
operator personally]
S3 --> Q{External advice needed?}
Q -->|Legal| L[Lawyer]
Q -->|Telegram report| T[Telegram support]
Q -->|Personal data| K[KISA]
Q -->|No| S5[Step 5, update policy]
L --> S5
T --> S5
K --> S5
style E fill:#fef2f2,stroke:#b91c1c
style S1 fill:#fff,stroke:#3b59c5
style A1 fill:#eef1fb,stroke:#3b59c5
style A2 fill:#eef1fb,stroke:#3b59c5
style S5 fill:#ecfdf5,stroke:#0f7b6c
If a dispute arises from members / chatroom / external sources:
Step 1, freeze auto-reply
Stop the affected chatroom's auto-reply (or all ops) immediately. Prevents additional responses from worsening the dispute.
Step 2, fact-find + preserve evidence
- Document the dispute (member messages / operator responses / timestamps)
- Preserve Replyer's response history / persona prompt history (no edits)
- Download a backup zip immediately (frozen at the dispute moment)
Step 3, 1:1 response to disputants
- Operator handles personally (no auto-reply)
- Honest disclosure of auto-reply use
- Apology + root cause + prevention plan
Step 4, external experts if needed
- Legal matters → lawyer
- Telegram-side issues → Telegram support
- Personal data → KISA (개인정보 침해 신고 센터)
Step 5, update chatroom policy
After the dispute:
- Strengthen the policy that the incident exposed (e.g. block commercial-message auto-reply)
- Update pinned message / chatroom intro
- Tighten operator response policy disclosure
FAQ
Q. Is chatroom auto-reply an ad-law violation?
Operator's regular response range = no direct violation. Auto-firing commercial messages (payment, external products, external link nudges) risks Network Act / Display Ad Act violations. Don't use auto-reply as an ad channel.
Q. Mandatory "AD" label in chatroom?
Voluntary members + non-commercial = no label needed. Commercial messages need "AD" label + opt-out instructions.
Q. Even local LLM - is feeding member messages into the tool considered data processing?
Strictly yes. But no external transmission + on operator's own PC + no permanent storage after auto-reply keeps risk at "memory-level processing on user PC" - low. External cloud LLMs (GPT / Claude) carry more risk.
Q. Can a member opt out of having their messages processed by auto-reply?
Recommended - state opt-out handling in chatroom rules. Excluded members' messages skip auto-reply + operator responds directly. Replyer's persona trigger can encode "exclude specific member" rules.
Q. What if my auto-reply produces defamatory / abusive content?
Operator's responsibility. Persona prompt's hard-banned phrases should include defamatory expressions + trigger rules block responses to specific members. See responding when AI replies get caught.
Q. After closing a chatroom, does response history need permanent preservation?
Operator's call. Replyer's response history is local on the operator's PC → at closure, operator backs up or deletes. Where disputes are possible, keep backups 1+ year.
Q. Same rules for chatrooms outside Korea?
No. Each country has different ad / privacy / communication rules. US operators face CAN-SPAM Act + GDPR (depending on EU member share) etc. Outside Korea, seek local advice.
Q. If the auto-reply tool itself (Replyer) hits legal issues?
Tool vendor (Replyer) and operator responsibility are separate. Operator decides tool usage / policy / member handling → operator-side responsibility. Tool defects (e.g. unintended external transmission) → vendor. In disputes, check the tool's terms of use + responsibility split.
Q. How do I stay updated on Korean ad / network law?
Check law.go.kr for ad / network law pages periodically. KISA publishes regular notices. Operator communities / lawyer blogs help too.
Next step
Grab the build for your OS from the Replyer download page and follow the usage manual for step-by-step setup.