Park Sun-won is a different person than Park Ji-won.
Park Sun-won was the DEPUTY head, not the head of the NIS.
Park Jie-won worked for Kim Dae-jung as well, mainly transferring money to North Korea's Kim Jong-il so that he'd agree to a summit with Kim Dae-jung. Details in this book, Korea Betrayed: Kim Dae-jung and the Sunshine (한글책: 김대중 신화) by Donald Kirk & Kim Ki-sam.