Contract Law in South Korea

Introduction

South Korean contract law is codified primarily in Part III (Obligations) of the Civil Code (민법, Act No. 471, 1958), which draws heavily from the German Bürgerliches Gesetzbuch (BGB) via Japanese civil law. The Code governs the formation, performance, breach, and remedies for contracts. The principle of good faith (신의성실의 원칙, Article 2) serves as a foundational norm permeating all contractual relationships.

Contract Formation

Offer and Acceptance

A contract is formed by agreement between offer and acceptance (Articles 527–534). The Civil Code follows the reception theory (Empfangstheorie): an acceptance takes effect when it reaches the offeror (Article 531). The offeror may withdraw an offer if the withdrawal reaches the offeree before or simultaneously with the offer.

Formalities

Korean contract law generally follows the principle of consensualism — contracts are valid upon mutual assent regardless of form (Article 527). Exceptions include:

• Real estate sale contracts require registration for transfer of ownership
• Guarantee agreements require written form (Article 428-2)
• Certain consumer contracts require written documentation

Capacity and Voidability

Contracts by minors (under 19), persons under adult guardianship, or limited guardians are voidable (Articles 5–14). The legal representative’s consent is required, though minors may independently contract for daily necessities.

Performance and Breach

Performance

Obligations must be performed in accordance with the terms and in good faith (Article 2). The debtor may perform through a third party unless the obligation is personal in nature (Article 469).

Breach and Remedies

Breach arises from:

• Impossibility (Articles 535, 537–538): If performance becomes impossible, the obligee may claim damages
• Delay (Article 396): The obligee may demand specific performance or damages
• Defective performance (Article 580): The obligee may demand repair, price reduction, or damages

Damages

Damages for breach include both actual loss and lost profits (Article 393). However, damages are limited to those reasonably foreseeable at the time of contracting, following the German Adäquanztheorie.

Good Faith Principle

Article 2 of the Civil Code provides: “(1) The exercise of rights and the performance of duties shall be in accordance with the principle of trust and good faith. (2) No abuse of rights shall be permitted.” The Constitutional Court and Supreme Court have invoked this principle to:

• Limit unreasonable termination of ongoing contracts
• Prevent abuse of procedural rights
• Impose pre-contractual duties of disclosure (culpa in contrahendo)

Standard Terms

The Act on the Regulation of Terms and Conditions (약관의 규제에 관한 법률, 1986) governs standard form contracts. Unfair clauses — those that unreasonably disadvantage consumers — are void.

Conclusion

South Korean contract law reflects its German civil law heritage while developing distinctive features through judicial interpretation, particularly in the broad application of the good faith principle. The 2021 amendments to the Civil Code modernized provisions on contracts, including new rules on termination and damages.