Attorney Park Jae-Soon completed the Judicial Research and Training Institute of the Supreme Court of Korea as a member of the 34th class in 2005, and he was thereafter appointed as a judge and served at various levels of the Korean court system and even served as a research judge at the Supreme Court of Korea. After completing his last term as a judge at Suwon High Court, he joined Barun Law LLC in 2024.

Attorney Park has served as a judge and chief judge at various district courts and has handled various criminal and administrative cases at the Suwon High Court. While serving as a research judge at the Supreme Court, he researched a variety of civil, criminal and family cases and sought measures to protect the legal rights of parties and limit excessive recognition of obligations. He is known for his skills in handling administrative and criminal cases, having handled many administrative cases, including cases involving reconstruction, redevelopment, and development permits, and various criminal cases, including the Goyang Terminal fire case, the case involving the chairman of a construction company who harassed his personal driver, and the case involving a leader of a religious group who interfered with quarantine efforts.

Attorney Park actively works to protect the rights of his clients based on his in-depth understanding of the entire decision-making process of the court, which he gained while serving as a judge.