No I didn't have eye surgery.
Yes, I know I'm wearing sunglasses.
Yes, I know it's winter.
It's also sunny outside and I was squinting, so I put on my sunglasses... because it's sunny.
In Korea, it's uncommon to see people wearing sunglasses in the winter, even if it's a very bright day. Sunglasses are a seasonal accessory, apparently. If you're wearing sunglasses in the winter, you either had eye surgery or, well, you're probably a foreigner. Oh Korea!