When the forced migration of Koreans began, Pak Ui-wan was forcibly relocated to the Uzbek SSR.
Then he divorced Natalia and marries a Goryeo-in, Pyongyang 6 school principal, Yulia Na Kwak.
In September 1948, with the formal establishment of North Korea and the inauguration of the first cabinet, he was appointed as the first minister of transport.
In March 1958, when the 1st Conference of the Workers' Party of North Korea was held, he was attacked fiercely and was expelled along with Kim Tu-bong and O Ki-sop.
Following the conference, in accordance with the decree of the Presidium of the Supreme People's Assembly, he was dismissed from the deputy prime minister and replaced by Ri Ju-yon.