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The story
June 1996: Establishment of Mediaplex Co., Ltd. to enter the movie business.
November 1999: Establishment of Megabox to enter the movie theater business.
January 2002: Establishment of Showbox brand and start of movie distribution investment.
December 2002: Their first film Sex Is Zero premiers and becomes the fifth most popular film of 2002; selling 4 million tickets.
February 2004: Taegukgi premiers and hits a new record of 11.74 million tickets sold.
August 2005: Welcome to Dongmakgol premiers and becomes (at the time) as the fourth highest grossing South Korean film of all time; selling 8 million tickets.
July 2006: The Host premiers and setting a new record of being (at the time) the highest grossing South Korean film of all time; selling 13 million tickets.
July 2007: Megabox is sold to Macquarie Investment Fund.
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August 2007:D-War premiers and setting a new record of being (at the time) the highest-budgeted South Korean film of all time; selling 8.42 million tickets.
February 2008: The Chaser premiers and sells 5 million tickets.
July 2009: Take Off premiers and becomes the 2nd most attended film of the year in South Korea; selling 8.39 million tickets.
February 2010: Secret Reunion premiers and becomes one of the highest grossing Korean films of 2010; selling 5.5 million tickets.
January 2011: Detective K: Secret of the Virtuous Widow premiers and becomes the 4th best selling Korean film of 2011; selling 4.78 million tickets.
February 2012: Nameless Gangster: Rules of the Time premiers and sells 4.71 million thousand tickets.
July 2012: The Thieves premiers and becomes (at the time) as the fifth highest-grossing movie in Korean film history; selling 12.9 million tickets.
May 2013: Secretly, Greatly premiers and breaks several box office records in South Korea: the highest single day opening for a domestic film, most tickets sold in one day for a domestic film, the biggest opening weekend, the highest-grossing webtoon-based film, and the fastest movie to reach the million, two million, three million, and four million marks in audience number; selling 4.71 million tickets.
September 2013: The Face Reader premiers and became one of the highest-grossing films in South Korea in 2013; selling 9.1 million tickets.
May 2014: A Hard Day premiers and sells 3.44 million tickets.
February 2015: Detective K: Secret of the Lost Island premiers and the 9th highest-grossing film of 2015; selling 3.87 million tickets.
March 2015: entered into an exclusive partnership with one of the biggest Chinese entertainment companies, Huayi Brothers, and expanding its way to China and a co-produced partnership with the Hollywood genre movie studio Blumhouse.
June 2015: Changed the company names from Showbox Mediaplex Co., Inc. to Showbox Corporation, in a step to unify the brand name.
March 2019: Showbox entered the drama production industry. It signed a consignment deal with generalist network JTBC, being the second film company to do so (the first being NEW).
From Wikipedia’s article on Showbox, shared under CC BY-SA 4.0.4