I would even rate the Korean start as a B. 2 luxuries, 3 valuable food tiles, iron, lot's of uncontested space to settle, and your land is very easily defensible against the AI. I think this start is well playable up to Emperor; on Demigod it might be a bit tough, depending on the quality of the AI start positions...
However, you did not capitalize on the most important asset of your position: the 1-tile lake! This could have been used to set up a 4-turn settler factory by irrigating own of the two cows. Therefore the first town (after the capital) should not have been founded in Wonsan's place, but 1SE of the lake (red circle in my screenshot). The second town then goes in Wonsan's place to make the two cows available to the first town.
You then mine the two bonus grasslands and one cow (m) and irrigate one grassland and a cow (i). This should be enough to make the first town a 4-turner.
Optionally you can also bring fresh water to the wheat as indicated in my screenshot, in order to give some decent growth to your capital. (You should never run your capital at size 1. The AI does it, but it wastes the production and commerce of your most powerful city! Let it grow to size 6 and then spit out the settler, instead of producing a settler at size 1. (Believe me: you will get many more settlers if you produce them at size 6 than when producing them at size 1...)
You need to be aware that the irrigation on the two grasslands does not bring any extra food until you are out of Despotism. But I think the power of the 4-turner and a faster growing capital will easily compensate for the "wasted" worker turns. And after you are out of Despotism, the two irrigated grasslands will be useful as well.
Lanzelot