English an official language here? And 3-side Gimbab.

This goes into the "they have obviously never been to Korea" category. From this article:

While information about neighboring countries such as Russia, Japan and China as well as North Korea seems correct, South Korea is falsely described as having English as its official language as well, which is a far stretch from reality.

You got that right!

And, from this article:

Korea's Triangle Rice & Seaweed Snack Pioneer Introduces Jumbo Option

As far as Kang Seung-gu is concerned, it all starts with size and shape. Kang, who introduced triangular gimbap in 1991, is now pushing the limits of the snack's seaweed wrapping by producing a jumbo gimbap that is about 50 percent larger. Fittingly, the jumbo version of the rolled-rice-and-filling snack is found on the shelves of 7-Eleven, the U.S. company that thinks big, too. Its "Big Gulp" drink size boasts enough volume to power a small car a few kilometers. Convenience stores throughout the nation sell more than 700,000 gimbap per day, compared to about 20,000 Big Macs sold by McDonald's. The snack contains the equivalent of a bowl of rice plus a modest serving of vegetable or seafood at a cost of 700 won.

Altering the size might not seem to be much in the way of hard work, but Kang, the president of Samgu Corp. based in Gyeonggi Province, spent 200 million won on purchasing and modifying a machine to produce the heftier gimbap. The process took 4 1/2 years. "I was hesitant to invest that much money, but then I thought that it would be worth my efforts," said the 59-year-old former navy mechanic. Samgu, which averages about 700 million won in sales a month and a 140 million won operating profit, is dedicating 30 percent of its production to the new item.

Kang expects a growth spurt from local appetites. "Koreans, especially guys, tend to eat until they feel stuffed. You might find that many purchase two triangular gimbap at a time, sometimes even with instant noodles," said Kang, who has gimbap every day. [I eat 1 jumbo or 2 smaller ones most days--JB] The food executive is less sanguine about a long-term impact. Copycat gimbap will soon appear, he confidently predicts. "There is nothing I can do, you know. The good news is that this time it will take a lot longer for competitors to figure out the new technology. I guess three months?" he said. [They already have--JB]

Currently, retail giants Lotte and LG operate their own gimbap processing plants, making small companies such as Samgu more vulnerable than before. Those market players are constantly putting forth new ideas such as gimbap vending machines. "Other than quickie food [nice choice of words--JB] and good service, convenience stores can hardly differentiate themselves," said Kim Il-jin, a public relations officer at LG 25, a convenience store chain run by LG Mart. Kang waded into the gimbap business in 1988. He had 10 employees working in a 99-square-meter basement. Little capital was needed. "All I needed was a rice cooker and a refrigerator," he said..."I am striving to make good-quality gimbap as a way of surviving. If not, I will just go bankrupt and will be chased away by debt collectors."

Sounds like he has a pretty tough row to hoe, but that's life in the commodity business in Korea.