Jinhyun Seong's primary practice areas include aircraft finance, project finance, overseas investment, private equity, real estate finance, asset management, and banking regulations. He primarily advises clients in the aerospace, energy and infrastructure, real estate, and banking industries.

In the aviation sector, Mr. Seong has provided ongoing legal advice for about a decade to major domestic airlines on aircraft acquisitions (purchases/leases) and domestic and international aviation law. He also advises major domestic banks, asset management companies, and investment institutions on overseas aircraft finance investments.

In the energy and infrastructure sector, Mr. Seong is actively involved in advising on investments in power generation facilities, including solar, wind, and combined-cycle plants, in the United States and Europe.