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A KakaoTalk Message Is a Contract: Court Orders Client to Pay ₩50 Million in Legal Success Fees

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A Korean court has ruled that a client’s KakaoTalk message committing to pay a specific sum by a specific date constitutes a legally binding modification of an existing fee agreement — and cannot be dismissed as a mere formality or collusive fiction. Here are the key points.

Issue

Does a KakaoTalk message in which a client specifies a payment amount, a recipient, and a deadline for a success fee constitute a binding contractual modification of an existing retainer agreement — even where the client later claims the message was sent merely as a formality at the lawyer’s request?

Facts

  • In December 2019 and July 2020, client B retained Law Firm A for two civil suits — an unjust enrichment claim and a damages claim — agreeing that the success fee would be 10% of the net proceeds remaining after B sold certain real property and repaid all debts from the sale proceeds.
  • B won both cases, with the final judgment confirmed in January 2022.
  • In June 2024 — more than two years after the judgment — B sent the following KakaoTalk message to the handling attorney C: “I will transfer ₩50 million to Law Firm A by June 30, 2025.”
  • B subsequently refused to pay, arguing that the original fee agreement was conditioned on the sale of the real property, and that since the property had not yet been sold — being subject to ongoing court auction proceedings — the payment condition had not been met.
  • B also argued that the KakaoTalk message was sent merely because attorney C had asked for it as a formality, and that it therefore constituted a collusive fictitious declaration under Article 108 of the Civil Act and was void.

Court Decision

  • Seoul Central District Court (Judge Song Seung-hwan) ruled in Law Firm A’s favor on April 24, 2026, ordering B to pay ₩50 million plus delay interest.
  • The court found that the KakaoTalk message constituted a binding modification of the original success fee agreement, for three reasons.
  • First, the message contained all the essential elements of a contractual commitment: a clearly identified payee, a fixed amount, and a specific deadline — with no conditions attached.
  • Second, B sent the message of his own volition. Even if attorney C had suggested specific wording, B had no reason to send it if he did not agree with the content. The act of sending was an exercise of B’s own autonomous will.
  • Third, the collusive fictitious declaration argument failed. For Article 108 to apply, both B and attorney C must have shared an understanding that the message did not reflect their true intentions. There was no evidence that C’s true intention differed from the message’s content — meaning the mutual collusion required for a fictitious declaration was not established.
  • The court also noted a subsequent exchange in which B responded to a payment reminder by saying he was not financially ready and that the auction proceeds might not cover all his debts. The court read this as an implicit acknowledgment that the payment obligation existed — B was citing inability to pay, not disputing the obligation itself.
  • Additional context weighed in the law firm’s favor: B had delayed payment for over three years after the judgment, and the ₩50 million agreed in the KakaoTalk message was significantly lower than what the original percentage-based formula would have produced.

Key Takeaways

  • A KakaoTalk message specifying a payee, amount, and deadline with no attached conditions can constitute a legally binding contractual modification under Korean law.
  • The fact that a lawyer suggested the wording of a message does not make it a fictitious declaration. The client’s voluntary act of sending the message is treated as genuine assent to its content.
  • Collusive fictitious declaration under Article 108 of the Civil Act requires mutual knowledge between both parties that the statement does not reflect true intent — it cannot be established unilaterally by one party claiming the message was insincere.
  • Subsequent conduct — such as citing financial difficulty rather than disputing the obligation — can be treated as an implicit admission that the debt exists.
  • A client who delays payment for years and later agrees to a reduced lump sum is in a weak position to argue that even that reduced commitment was not meant seriously.

Why This Matters

This ruling has broad practical implications for anyone who uses messaging apps to discuss financial commitments — legal fees or otherwise. Korean courts will treat a clearly worded KakaoTalk message as a binding contractual instrument if it contains the essential elements of a promise: who pays, how much, and when. For legal practitioners, it reinforces the evidentiary and contractual weight of digital communications in fee disputes. For clients, it is a reminder that messages sent in the course of a legal engagement — even casually worded ones — may be held against them in court.

Article: https://www.lawtimes.co.kr/news/articleView.html?idxno=221295

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