That's odd
The story of ethnic Koreans in Soviet Central Asia was not publicly acknowledge within the Soviet Union for more than 50 years. You would think Russian film critics would be eager to blaze new paths by addressing the ethnicity of the hero in this movie. But to my knowledge, not one has. Moro's ethnicity may be incidental to the narrative, but the very fact that Koreans were practically invisible in Soviet cinema and history for so many decades makes it incumbent upon critics to recognize Moro/Tsoy for what he was: Korean.