Question: Which MBC show aired in the same Sunday night slot before April 2015 as "Secretly Greatly" did from December 2016?

Context paragraphs:
Sunday Night (South Korean TV series): Sunday Night () is the longest-running South Korean television entertainment programme airing on MBC.  It runs for 175 minutes, including roughly fifteen minutes of advertising.  Previously named "Big March of Sunday Night" () when it debuted in 1981, and changing its name to "Sunday Sunday Night" () in 1988, in March 2011, the show has changed its name for the second time in its history in an effort to increase its popularity again at the 5:20PM timeslot, with its rival contenders, KBS2's "Happy Sunday" and SBS's "Good Sunday".  As of April 29, 2012, the name was once again changed to its most commonly known abbreviation, "Sunday Night" (일밤 ).

Animals (South Korean TV series): Animals () was a South Korean reality-variety show; a part of MBC's "Sunday Night" lineup, along with "Real Men".  It was first aired on January 25, 2015 replacing "Dad!  Where Are We Going? ".  It features eleven celebrities who experience living with a variety of animals in an area created for the show called "Animal Town".  On March 16, 2015, MBC confirmed that the show will be cancelled after 3 months due to low ratings.  The show ended on March 29, 2015 and was replaced by "King of Mask Singer".

King of Mask Singer: Mystery Music Show: King of Mask Singer () is a South Korean singing competition program presented by Kim Sung-joo, with introductions by voice actor .  It airs on MBC on Sunday at 16:50, starting from April 5, 2015 as a part of MBC's "Sunday Night" programming block, along with "Real Men", replacing "Animals".

Happy Sunday: 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".

Good Sunday: Good Sunday (Korean: 일요일이 좋다 ) is a South Korean reality-variety show shown on the SBS network, which competes directly against MBC's "Sunday Night" and KBS2's "Happy Sunday" line-up.  The program has suffered from the competition of "Happy Sunday" and "Sunday Night" but reached its way to #1 on the Top 20 Charts every Sunday.  "Good Sunday" consists of a line-up of "corner programs", or segments, which air within the program.  The program ended on March 19, 2017, opting for individual programs divided into two parts for inserting commercials (which is not allowed for programs on terrestrial television).

TNT Sunday Night Football results (1990–1997): This is a list of results of National Football League games played on Turner Network Television (TNT).  From 1990–1997, TNT broadcast NFL games on Sunday nights for the first half of the regular season (or nine games a year).  Meanwhile, ESPN would pick things up for the second half of the season.  TNT also got a couple of Thursday night games to show, which were aired in place of Sunday night games (that would have otherwise conflicted with the World Series; coincidentally, the , , , and editions of the World Series featured the Turner-owned Atlanta Braves).  Following the 1997 season, ESPN would broadcast Sunday night NFL games for the whole season.  This particular arrangement between ESPN and the National Football League would continue until the end of the 2005 season.  Since that time, NBC (who last broadcast NFL games the same year that TNT last broadcast them, 1997) has been the television home of Sunday night games.  Meanwhile, ESPN has replaced as the broadcaster of Monday night games.

Secretly Greatly (TV series): Secretly Greatly () is a 2016 South Korean television program starring by Yoon Jong-shin, Lee Soo-geun, Kim Hee-chul, Lee Guk-joo and John Park.  It aired on MBC every Sundays at 18:45 (KST) starting December 4, 2016, forming part of MBC's "Sunday Night" lineup.  It aired after "King of Mask Singer" and replaced "Real Men".  The last episode of this program was broadcast on May 21, 2017.

The ABC Sunday Night Movie: The ABC Sunday Night Movie is a television program that aired on Sunday nights, first for a brief time in 1962 under the title "Hollywood Special" (although "Time" magazine lists this version as "The Sunday Night Movie") to supposedly replace an open time slot for a cancelled TV show, "Bus Stop", which was cancelled after March 1962.  It then began airing regularly under its more commonly known title from late 1964 to 1998, on ABC.  Since 2004, it has aired sporadically as a special program, now titled the "ABC Sunday Movie of the Week", though as of the 2011-12 television season, the only films in this timeslot were aired under the "Hallmark Hall of Fame" banner, which transferred to ABC in that season.  However, in 2014, The Hallmark Hall of Fame moved exclusively to cable on the Hallmark Channel, and as a result, said program is no longer on broadcast television in any form (including ABC) for good.  As a result of this, the Sunday Night Movie is now exclusively relegated to 2 special holiday movies, "The Sound of Music" every holiday season and "The Ten Commandments" every Easter.

Al Murray's Happy Hour: Al Murray's Happy Hour was a chat show presented by comedian Al Murray and produced by Avalon TV.  The first series aired in early 2007.  It is broadcast on the British terrestrial TV network, ITV, and the first series was broadcast on Saturday nights at 10pm.  The second series aired on Fridays at 10pm.  A third series returned to ITV on 12 September 2008, in the same 10pm Friday night slot.  However, UTV in Northern Ireland did not show the third series in the 10pm Friday night slot with the other ITV regions.  They now show it the following Thursday at around 11.40pm, due to UTV regional programming on Friday nights.  Murray presents the programme in his "Pub Landlord" persona: a stereotypically nationalistic, chauvinistic character.

Iain Lee: Iain Lee (born Iain Lee Rougvie; 9 June 1973) is an English comedian and broadcaster.  His career began when he performed stand-up comedy gigs across venues in London.  He subsequently became co-presenter of the comedy current affairs show "The 11 O'Clock Show" on Channel 4 and "".  After three years at London talk radio station LBC 97.3, Lee resigned and, after two years presenting a Sunday night slot, hosted "Iain Lee's 2 Hour Long Late Night Radio Show" on Absolute Radio until leaving the company on 17 October 2011.

Supporting paragraphs: Secretly Greatly (TV series) King of Mask Singer
Answer: "Animals"