He married a German woman and returned to North Korea in the late 1940s.
Do became a professor at Kim Il Sung University in Py'ǒngyang in 1947 and served as the director of a number of archaeological institutes through the 1960s.
To was responsible for leading archaeological excavations at North Korean sites such as Kulp'o-ri, Ch'itam-ni, Odong, Allak, Ch'o-do, and Kungsan-ni.
To's major monograph, Chosǒn Wonsi Kogohak, laid the groundwork for archaeological research in North Korea from the 1960s through the 1990s.
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