Happy Sunday (Korean: 해피 선데이) is a Korean reality-variety show shown on the KBS2 network, which competes directly against MBC's Sunday Night and SBS's Good Sunday line-up. Although it has been broadcast since 2003, its line-up of shows has frequently changed, with a complete revamp occurring in Spring of 2007. At that time, three new shows were introduced – Are You Ready, High-Five, and Immortal Songs. Due to its poor reception, Are You Ready quickly evolved into 1 Night 2 Days, with most of its cast intact. In late November 2008, Happy Sunday had a revamp of its shows keeping 1 Night 2 Days as the second segment and bringing back Immortal Songs which was previously liked by viewers. However, in late March, Immortal Songs ended once again and was replaced with Qualifications of Men, making Happy Sunday an all-male cast, with a total of 14 members. In 2013, Qualifications of Men was cancelled and replaced with Star Family Show Mamma Mia. On November 3, 2013 Star Family Show Mamma Mia was moved to Wednesday nights and replaced with The Return of Superman.