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South Korea
3

Intellectual property: local firms

Yoon & Yang LLC logo

Yoon & Yang LLC

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Yoon & Yang LLC has recently established a trade secret group and a biohealth centre focusing on trade secret disputes in the pharmaceutical industry. To strengthen this area, they have hired Dong Young Shin, a former examiner at the National Institute of Food and Drug Safety Evaluation. Donju Kwon leads the IP team, with experience in patents, trademarks, designs and trade secrets disputes. Changkwon Kim is well-versed in disputes for pharmaceutical, biotech and healthcare companies, while Sejung Lee’s practice sits at the intersection of antitrust and intellectual property.
Legal 500 Editorial commentary

Accolades

Client satisfaction: Billing & efficiency
Client satisfaction: Sector knowledge

Testimonials

Collated independently by Legal 500 research team.

  • 'Yoon & Yang’s IP team stands out for its deep expertise in patent litigation, particularly in complex pharmaceutical cases. The team includes professionals with prior judicial experience at the Patent Court and Supreme Court, which enables them to anticipate judicial reasoning and craft highly strategic arguments. Their collaborative approach, clear communication, and efficient case management make them a reliable partner.'
  • 'The individuals I’ve worked with at Yoon & Yang distinguish themselves through their strategic insight and clarity in communication. Former judges and judicial researchers bring unmatched understanding of court procedures and decision-making patterns. In particular, Attorney Dongju Kwon and Attorney Changkwon Kim demonstrated outstanding capabilities, showing deep legal insight, strategic thinking, and a strong understanding of both the technical and procedural aspects of the case.'

Key clients

  • SK Innovation (SK ON)
  • Merck Sharp & Dohme Corp.
  • W-Scope
  • SK Hynix
  • SK Bioscience
  • SK Chemicals
  • Hanmi Pharm
  • Kolon Life Science
  • Medytox
  • Kumho Petrochemical
  • SK Shipping
  • Hyundai Mobis

Work highlights

Represented Hanmi Pharm in subsequent appeals following the contested validity and scope of Novartis AG's "ENTRESTO" patent at IPTAB.
Successfully represented Kolon Industries in a patent dispute against HS Hyosung over tire cords.
Defending Hyundai Mobis in a patent infringement case brought by Autoliv ASP, Inc. over airbag cushion technology, while also challenging the validity of Autoliv's patents.

Practice head

Dongju Kwon

Other key lawyers

Changkwon Kim; Sejung Lee; DongHyun Kim

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