Park first denied the plagiarism controversy towards Song, insisting he will "resign his position if any part of his paper is found unoriginal." He also argued that Song's work on partial differential equation is totally of Song's, which is worth to be a "meaningful contribution as a doctoral student." Against the argument that several parts of Song's paper is appeared to overlap Park's proceeding in 2002, Park said that the proceeding is conventionally not considered as an 'official' paper, so citing the proceeding paper is not a requirement nor an offence against academic integrity or research ethics.