Can You Add New Evidence After Filing a Civil Lawsuit?

Short Answer

Yes. In Korean civil litigation, parties may generally submit additional evidence after filing a lawsuit.

However, evidence should be submitted in a timely manner. Korean courts may set deadlines for submissions, and late evidence or late arguments may be rejected if they are submitted too late without justification and delay the proceedings.

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Can Evidence Be Submitted Throughout the Lawsuit?

Generally, yes. Parties often submit additional evidence as written briefs are exchanged during the lawsuit.

For example, a party may discover new documents after filing the complaint or obtain records that were previously unavailable.

That said, this does not mean evidence can be submitted freely at any time. Korean civil procedure expects parties to submit arguments and evidence at the appropriate stage of the proceedings.

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What Types of New Evidence Can Be Submitted?

Various types of evidence may be added after the lawsuit has begun.

Examples include:

• Written contracts
• Emails
• Purchase Orders (POs)
• Invoices
• Bank transfer records
• Business correspondence
• Photographs and videos
• Electronic messages
• Expert reports
• Official documents obtained from public authorities

The court will consider the relevance, credibility, and timing of the newly submitted evidence together with the existing record.

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Can Evidence Be Submitted in Response to the Other Party's Arguments?

Yes.

This is one of the most common reasons for submitting additional evidence.

As the defendant files an Answer and subsequent briefs, the plaintiff may submit further evidence to rebut factual allegations or support its own position. Likewise, the defendant may also introduce new evidence in response to the plaintiff's submissions.

In practice, briefs containing new arguments or evidence should be filed early enough for the other party to review and respond before the next hearing.

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What Happens If Important Evidence Is Found Late?

Finding important evidence after the lawsuit has already begun does not necessarily prevent it from being used.

However, late submission may cause practical and procedural issues, such as:

• Additional response time for the opposing party
• Additional hearings
• Delay in the proceedings
• Risk that the court may reject the late submission

If the late evidence is important, the party should be prepared to explain why it was not submitted earlier and why it is necessary for the case.

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What If Evidence Is Found After Oral Arguments Are Closed?

Once oral arguments are closed, submitting new evidence generally requires the court to reopen the proceedings.

Whether to reopen the proceedings is usually within the court's discretion. Therefore, parties should not assume that evidence found after the close of oral arguments will automatically be considered.

This is one reason why evidence should be identified, organized, and submitted as early as possible.

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Should You Wait Until the End to Submit Your Best Evidence?

Generally, no.

Although parties may submit evidence during the litigation, intentionally withholding important evidence until the final stage is rarely advisable.

Early submission allows:

• The court to understand the dispute more clearly
• The opposing party to respond in an orderly manner
• The litigation to proceed more efficiently
• The party's position to appear more credible and consistent

Presenting key evidence at an early stage often strengthens the overall presentation of the case.

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How Should Evidence Be Organized?

Well-organized evidence is often as important as the evidence itself.

Documents should ideally be arranged:

• Chronologically
• By subject matter
• With clear explanations of what each document proves
• Together with the relevant factual allegations

A well-structured evidentiary record allows the court to understand the case more efficiently and reduces the risk that important materials will be overlooked.

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Key Takeaways

• Parties may generally submit additional evidence after filing a civil lawsuit.
• Evidence must still be submitted in a timely manner.
• Korean courts may set submission deadlines.
• Late evidence may be rejected if it unjustifiably delays the case.
• After the close of oral arguments, new evidence generally requires the court to reopen the proceedings.
• Organizing evidence clearly and systematically can significantly strengthen a case.

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Conclusion

Submitting additional evidence after filing a lawsuit is a normal part of Korean civil litigation.

However, parties should not treat evidence submission as something that can be delayed until the last moment. Timely submission, careful organization, and a clear explanation of what each document proves can play a significant role in the successful resolution of a dispute.

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