I went out to a few stores, and did some internet research. Found a mail conversation with samyang on a Swedish forum. According to them none of their noodles sold abroad contains meat, fish, eggs or diary production. The egg noodles are supposed to just be domestic. However, a lot of my local Asian food stores carry Samyang products with eggs, probably obtained through a Korean re-seller rather than Samyang themselves.

Here's the ingredients of the (vegan) 2x that I just bought:

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tl;dr: it's probably vegan, but you should still check the ingredients.