Only thing even remotely shitty here is the tortilla. Pickled herring and kimchi are both fantastic, and the only reason this isn't a regular banchan is because... actually, maybe it is a regular banchan. They eat pickled herring in Japan, though it's a somewhat different kind of pickling, so it wouldn't surprise me at all to find pickled herring and kimchi as a Korean side dish people actually eat from time to time. But they'd probably wrap it in lettuce rather than a tortilla for some delicious ssam.