연안식당 went from 400 stores and ₩100B revenue to a ₩200M fire sale in five years

연안식당 (Yeonan Sikdang) launched in 2017 as a Korean seafood franchise built around 꼬막 비빔밥 — cockle bibimbap topped with manila clam, sea squirt and cockle. The concept was a hit: 160 franchise contracts were signed within nine months, and the chain grew to over 400 stores nationwide, with lunchtime queues around Seoul's office districts. Each store consumed over 800 kg of cockles per month. The parent company, Didim E&F, also operated 마포갈매기 (Mapo Galmaegi) and other restaurant brands, with combined annual revenue approaching ₩100 billion.

The pandemic exposed the model's fragility. Yeonan Sikdang depended on dine-in traffic and could not easily convert to delivery. Fresh seafood created massive spoilage losses — even refrigerated cockles faced shelf-life problems, and hundreds of kilograms per store were discarded monthly. In 2020, revenue fell 34% to ₩78.2 billion and the company posted an ₩11.2 billion operating loss. The losses did not stop: five consecutive years of deficits accumulated to over ₩68 billion. The stock fell from ₩30,000–40,000 to around ₩4,000, a 90% decline.

Corporate governance collapsed alongside the business. The largest shareholder changed four times in one year. In March 2024, the Korea Exchange suspended trading of DDNF shares and initiated a delisting review. The company, renamed Sunshine Food, faced complete capital erosion and an inability to pay debts. More than half of Yeonan Sikdang's stores closed over two years. The management rights that once controlled a ₩100 billion revenue business were sold for ₩200 million.

The decision cost ₩68B in cumulative losses, a 90% stock decline, and delisting, with management rights sold for ₩200M.

The franchise model was built on a single trending ingredient — cockle bibimbap — with no menu diversification to sustain demand after the trend faded.

Fresh seafood at 800+ kg per store per month created enormous spoilage and waste costs that became unsustainable when foot traffic declined.

Rapid expansion to 400+ stores in under three years created a fixed-cost base that required sustained volume growth the market could not deliver.

Four shareholder changes in one year and a management-control dispute destroyed strategic continuity at the exact moment the business needed a coherent turnaround plan.

A franchise built on a single trending ingredient is a bet on the trend's duration. When the ingredient is perishable and the format is dine-in-only, the downside is faster than the upside was.

Sunshine Food (formerly Didim E&F) faced delisting from the Korea Exchange. More than half of Yeonan Sikdang's stores closed. The case became a cautionary tale in Korean franchise industry discussions about the dangers of single-product trends and overexpansion.