Attorney Park Jong-han reviewed national contracts such as supply contracts and construction contracts as a military legal officer, and handled litigation cases related to national contracting law, compensation for expropriation, and construction litigation as a representative for national lawsuits. He also managed various criminal cases such as embezzlement, breach of trust, sexual assault, assault, and defamation, as well as discipline cases involving military personnel as a military prosecutor in South Korea. Furthermore, while serving as a judicial researcher at the High Military Court, he successfully performed judicial duties.

Later, at the law firm Pacific (LLC), he provided legal consulting and litigation services concerning real estate development projects and construction work undertaken by large corporations and public institutions, as well as urban development projects, reconstruction and redevelopment projects undertaken by local governments and unions, and construction projects for apartment buildings in the construction and real estate fields and various civil and criminal cases.

Currently, as a member of the law firm Cheongchul, he provides high-quality legal services in areas such as construction and real estate, corporate legal affairs, the Serious Accident Punishment Act, and general civil and criminal cases.