Question: The impeachment of Park Geun-hye, former President of South Korea, was the culmination of a political scandal involving interventions to the presidency from her aide, a fresh election was held on which date, electing Moon Jae-in, former leader of the Democratic Party, as the next president?

Context articles: Korea Vision Party
Choi Soon-sil
2016–17 South Korean protests
South Korean presidential election, 2012
Liberty Korea Party
Kaesong Industrial Region
Impeachment of Park Geun-hye
Lee Hahn-koo
Hwang Kyo-ahn
Moon Jae-in

The Korea Vision Party (Korean: 국민생각 , "Gungmin Saenggak", "National Thought"), more commonly known as the K Party, is a center-rightist political party in South Korea.
 It was founded on 12 February 2012 by Park Se-il, president of the Hansun Foundation, a conservative think tank.
 There are concerns that the K Party will split the conservative vote, though Park Se-il met with Saenuri leader Park Geun-hye on 23 February, with Park Geun-hye commenting that "If a party holds the same values and orientation, we are open to partnering".
 The party aims to field over 200 candidates in the April elections, favoring the selection of women and younger politicians.
 In an opinion poll conducted on 24–25 February 2012, the K Party received a support level of 1.4%, out-ranking the more established New Progressive Party.
 Analysts have nonetheless raised questions over the ability of the party to secure seats, even if sitting Assembly members do defect.
Choi Soon-sil (] ; born June 23, 1956) is the prime person of interest in the 2016 South Korean political scandal involving her influence over the 18th President of South Korea, Park Geun-hye.
Since October 2016, a series of protests against President Park Geun-hye have occurred throughout South Korea.
 After the initial demonstrations on October 26, 2016, thousands of South Korean protesters denounced the Park administration's political scandal and called for the resignation of Park Geun-hye.
The 18th South Korean presidential election was held in South Korea on 19 December 2012.
 It was the sixth presidential election since democratization and the establishment of the Sixth Republic, and was held under a first-past-the-post system, in which there was a single round of voting and the candidate receiving the highest number of votes was elected.
 Under the South Korean constitution, presidents are restricted to a single five-year term in office.
 The term of incumbent president Lee Myung-bak has ended on 24 February 2013.
 According to the "Korea Times", 30.7 million people voted with turnout at 75.8%.
 Park Geun-hye of the Saenuri party was elected the first female South Korean president with 51.6% of the vote opposed to 48.0% for her opponent Moon Jae-in.
 Park's share of the vote was the highest won by any candidate since the beginning of free and fair direct elections in 1987.
The Liberty Korea Party (Hangul: 자유한국당 ; Hanja: 自由韓國黨 ; lit.
 Free Korea Party ) is a conservative political party in South Korea.
 Until February 2017, it was known as the Saenuri Party (Hangul: 새누리당 ; lit.
 New Frontier Party ), which was previously known as the Hannara Party (Hangul: 한나라당 ; lit.
 Grand National Party ), both of which are still colloquially used to refer to the party.
 The party formerly held a plurality of seats in the 20th Assembly before its ruling status was transferred to the Democratic Party of Korea on December 27, 2016, following the creation of the splinter Bareun Party by former Saenuri members who distanced themselves from President Park Geun-hye in the 2016 Korean presidential scandal.
The Kaesong Industrial Region (KIR) or Kaesong Industrial Zone (KIZ) is a special administrative industrial region of North Korea (DPRK).
 It was formed in 2002 from part of the Kaesong Directly-Governed City.
 On February 10, 2016, it was temporarily closed by the South Korean government and all staff recalled by the Park Geun-hye administration, although the incumbent President of South Korea, Moon Jae-in, has signalled his desire to "reopen and expand" the region.
The impeachment of Park Geun-hye, former President of South Korea, was the culmination of a political scandal involving interventions to the presidency from her aide.
 The impeachment vote took place on 9 December 2016, whilst 234 members in the 300-member National Assembly voting in favor of the impeachment and temporary suspension of Park Geun-hye's presidential powers and duties.
 Thus, Hwang Kyo-ahn, then prime minister, became acting president while the Constitutional Court of Korea was due to determine whether to accept the impeachment.
 The court upheld the impeachment in a unanimous 8–0 decision on 10 March 2017, removing Park from the office.
 A fresh election was held on 9 May 2017, electing Moon Jae-in, former leader of the Democratic Party, as the next president.
Lee Hahn-koo (Hangul: 이한구 ; Hanja: 李漢久 ; born 12 December 1945) is a South Korean politician and leader of the Saenuri Party in the National Assembly.
 A former economist, Lee was previously an economic adviser and chief of staff to Park Geun-hye, and in the 2012 parliamentary elections he campaigned on the slogan "Make Park Geun-hye the next president".
 He studied at Seoul National University and completed a doctoral degree in economics at Kansas State University before serving the South Korean Ministry of Finance as a civil servant.
 He is now serving his fourth term in the Assembly, having been elected as a proportional representation candidate in 2000 before becoming member for Suseong-gap in Daegu in 2004.
Hwang Kyo-ahn (Korean: 황교안 , Hanja: 黃敎安, RR: Hwang Gyo-an; born 15 April 1957) is a South Korean lawyer and was the 44th Prime Minister of South Korea from 18 June 2015 to 11 May 2017, having previously served as Justice Minister.
 Hwang served as Acting President of South Korea following the impeachment and removal of President Park Geun-hye by the Constitutional Court of Korea on 10 March 2017, until the election of Moon Jae-in on 9 May 2017.
 He had already taken over Park's presidential powers and duties on 9 December 2016 when impeachment proceedings were launched against her by the National Assembly and she was suspended from the powers and duties of the office.
Moon Jae-in (Hangul: 문재인 ; Hanja: 文在寅 ; ] ; born 24 January 1953) is the current President of South Korea.
 Moon was elected after the impeachment of his predecessor, Park Geun-hye in the 2017 South Korean presidential election.