Famous Restaurant is a Manga/Manhwa/Manhua in english language, Drama series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

A years-long unemployed ‘Joo In Gong’, he lied and said he’s a famous restaurant owner’ under his friend’s provocation at the alumni reunion. In order not to be embarrassed in front of his friends, In Gong must become the owner of a really famous restaurant! As he was anxious to see his restaurant only being visited by flies, he got a mysterious ingredient from a foreign worker who lived upstairs. He then became the owner of a famous restaurant flooded with customers overnight. The happiness that seemed to last forever was short-lived because not long after, Joo In Gong found out the truth about the spice….