Bluehole (until April 2015 Bluehole Studio, also BHS) is a Korean based developer founded in March 2007 by Chang Byung-gyu with five to six cofounders. Several of the founders were former NCsoft employees. They're the sole developer of TERA, a fantasy massively multiplayer online roleplaying game as well as PlayerUnknown's Battlegrounds.
Bluehole Studio established En Masse Entertainment to publish and maintain TERA in North America. PUBG Corporation was later split from Bluehole. In November 2018 companies were rearranged under newly founded parent company, Krafton Game Union.
In September 2017 Chinese Tencent bought 5% of the company. In May 2018 Bluehole was valued at $4.6 billion much due PUBG success.
"We are filled with passion for achieving our vision of becoming the world’s preeminent MMORPG creator. We have teams with skills and talents to make that passion come true. We have people who are not afraid of change and enjoy challenge. Through unwavering belief in our people, we will continue to strive our hardest to develop top-quality games. We’ve done it before, and we will do it again."