Large marts in Incheon such as Homeplus, Lotte Mart, and Emart are closed on every 2nd and 4th Sunday, due to a Korean law. The law is supposed to help smaller businesses stay competitive. This law is the same for most other places in South Korea, although there are some exceptions.

You can also load up this website to find out: www.ishomeplusopen.com . Although it refers to Homeplus, the Sunday closings are the same for all other marts.