Hmm, sounds plausible. I'm only familiar with South Koreans, though.
This look isn't that common in Korea, and usually found in North Korea. South Koreans look more Japanese-y or Chinese-y or typically Korean, if you know what I mean.
From my experience, I would say that (2) looks typically Manchu, but this phenotype is also found less frequently in Korea (obviously, since the woman in the photo is actually a Korean).
And from the pictures SNK posted, (2) looks typically Korean.
In order from most common to least common in Korea, I would rank them as follows: (3) = Korean, (4) = hybridized Korean, (2) = Manchu, (1) = modern Chinese. I think look (2) ("hybridized Korean") is the result of random intermixture of all the different types found in Korea (mostly Korean types, with less frequent Manchu, Japanese, and Chinese types). The "pure" types (1, 2, 3) are not really pure in regard to their instantiation in any modern Korean individual, but rather atavistic; in other words, an individual who has look 1, 2, or 3 is not necessarily a pure-blooded Chinese, Manchu, or Korean, but merely happens to look stereotypical of one of those groups because of this individual's particular combination of traits.
"Tungus" in the ethnological/anthropological sense refers to Evenks, an indigenous people of eastern Siberia. It most certainly does not refer to Manchus. The only association between Manchu and Tungus is the fact that they both speak (or have historically spoken) languages that have been categorized in the "Manchu-Tungus language family," or what is otherwise known as the "Tungusic language family."
But Isn't Manchu typically should be (3) looks, they Tungus aren't they?