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

full_context: Document 1: 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".
Document 2: MBC Standard FM: HLKV-AM (Hangul: MBC 중파라디오) also known as MBC Standard FM is a general (News, Current affairs, Sports, Entertainment) radio station of the Munhwa Broadcasting Corporation. known as South Korea's first commercial radio station and known programs such as MBC Radio Nationwide News 7, Jung Joon-young's shimshimtapa radio, dreaming garret, missing night, midnight music box and Heo Kyung-hwan's Starry Starry Night. The station is also known for radio dramas.
Document 3: The Emperor: Owner of the Mask: The Emperor: Owner of the Mask () is a South Korean television series starring Yoo Seung-ho, Kim So-hyun, Kim Myung-soo, Yoon So-hee, Heo Joon-ho and Park Chul-min. It aired on MBC every Wednesday and Thursday at 22:00 (KST) from May 10, 2017 for 40 episodes.
Document 4: 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".
Document 5: 100 People, 100 Songs: 100 People, 100 Songs () was a 2014 South Korean singing competition program presented by Kim Sung-joo, Jang Yun-jeong and Moon Hee-joon. It aired on JTBC from October 31, 2014 to September 27, 2015.
Document 6: 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.
Document 7: Shinhwa Broadcast: Shinhwa Broadcast () is a South Korean variety television programme broadcast on general service cable channel Joongang Tongyang Broadcasting Company (jTBC). It is hosted by six-member boy band Shinhwa: Eric Mun, Lee Min-woo, Kim Dong-wan (up till April 2013), Shin Hye-sung, Jun Jin and Andy Lee (up till November 2013). The weekly programme premiered on 17 March 2012, and airs on Sundays at 23:00. The show went on hiatus after the 16 June 2013 broadcast and it returned on 3 November 2013 with a new format for season two. As of 8 December 2013, 65 episodes in two seasons have been broadcast.
Document 8: Jung Joon-young: Jung Joon-young (born February 21, 1989) is a South Korean singer-songwriter, radio DJ, host, actor, and television personality. He first gained recognition in Mnet's reality television talent show, "Superstar K4" (2012), where he finished third place. In 2013, he became the youngest member of KBS's variety show "2 Days & 1 Night" Season 3. He hosted his own radio program titled MBC FM's "Jung Joon-young's Simsimtapa" (2014) and made his big screen debut in "Love Forecast" (2015). Since 2015, Jung is the lead vocalist of rock band Drug Restaurant, previously known as JJY Band, releasing their first album "Escape to Hangover" in May 2015
Document 9: Inkigayo: Inkigayo (Korean: 인기가요 ; English title: The Music Trend, previously Popular Song) is a South Korean music program broadcast by SBS. It airs live every Sunday at 12:10 PM KST. The show features some of the latest and most popular artists who perform on stage. Since February 5, 2017, it is hosted by Park Jin-young, Kim Ji-soo and Kim Do-young. It is broadcast from the SBS Open Hall in Deungchon-dong, Gangseo-gu, Seoul.
Document 10: Memory (2016 TV series): Memory () is a South Korean television series starring Lee Sung-min, Kim Ji-soo and Park Jin-hee. It replaced "Signal" and aired on cable network tvN on Fridays and Saturdays at 20:30 (KST) from March 18, 2016 to May 7, 2016 for 16 episodes.
Document 11: Lee Hyun-woo (actor): Lee Hyun-woo (born March 23, 1993) is a South Korean actor and singer. He began his career as a child actor when he was nine, and later appeared in the television series "The Return of Iljimae" (2009) and "Queen Seondeok" (2009). He was also featured in "Master of Study" (2010) and "To the Beautiful You" (2012). Lee gained recognition with his role as a North Korean spy in the 2013 film "Secretly, Greatly" as well as a genius hacker in 2014's "The Con Artists". In 2016, he landed his first leading role in KBS2's "Moorim School". In 2017, he starred in his second leading role in tvN's "The Liar and His Lover", alongside Red Velvet's Joy
Document 12: Game Show (TV series): Game Show () is a 2016 South Korean television program starring by Kim Hee-chul, Bae Sung-jae, Jang Ye-won.
Document 13: List of Shinhwa Broadcast episodes: This is a list of episodes of Shinhwa Broadcast (), a South Korean variety television programme, broadcast on general cable channel Joongang Tongyang Broadcasting Company (jTBC). The show is hosted by the six-member boy band Shinhwa: Eric Mun, Lee Min-woo, Kim Dong-wan, Shin Hye-sung, Jun Jin and Andy Lee.
Document 14: Hidden Singer: Hidden Singer () is a South Korean entertainment TV program broadcast on JTBC. The mechanics are a famous singer and several impersonators of the singer. Each person sings one measure of a song behind the blinds for four rounds. In the first three rounds, an audience of 100 people vote on the person who they think is not the real singer. In the final round, the audience votes on who they think is the real singer. The program is hosted by Jun Hyun-moo.
Document 15: Our Gap-soon: Our Gap-soon () is a 2016–2017 South Korean television series starring Kim So-eun and Song Jae-rim. This is the first time that a virtual couple from MBC's "We Got Married" co-stars as main cast in a serial drama on a national Korean television network. It aired on SBS every Saturdays to Sundays at 20:45 (KST) from August 27 to October 30, 2016, and then 2 episodes every Saturdays from November 5, 2016 to April 8, 2017. This change generated a rating increase that led to an 11-episode extension, making the series end with 61 episodes.
ground_truth: "Animals"