SEOUL, Feb. 8 -- South Korea's social media has been on a full-blown sushi roll this week, thanks to a Seoul conveyor-belt joint that banned a family for polishing off 30 plates of just two types of fish - a saga that has everyone asking: how many flounder is too many flounder?

What began as a quiet early lunch quickly turned into the country's most talked-about dining drama.

A woman in her 50s, known only as A, reportedly took her mother, husband and younger brother to their usual sushi spot.

Her mother only eats flounder, her brother really likes salmon, and the family were the first customers of the day.

So they did what hungry people do: ordered 20 plates of salmon, 10 plates of flounder, and grabbed a few eel and tuna plates for ...