Netmarble Games is preparing to publish its blockbuster mobile game Lineage 2: Revolution in the West, and it has enlisted TV late-night comedian Conan O’Brien to help it raise awareness in the U.S. and Europe.

The O’Brien appearance is part of an aggressive marketing campaign as the company prepares to launch the free-to-play, massively multiplayer online action role-playing game in the U.S. and Europe on November 15, said Seungwon Lee, chief global officer of Netmarble Games, in an interview with GamesBeat. The stakes are high, as Lineage 2: Revolution scored an astounding $176 million in revenues in its first month in South Korea alone. More than 1 million people have signed up for the global version.

“We really hope this game will do well in the U.S. and Europe,” Lee said. “We are being much more aggressive with this launch than we have been before for any other game.”

Lineage 2: Revolution December 2016 in South Korea, and it expanded to 11 other countries in Asia in June. Tencent plans to publish the game in China. Netmarble is showing the multiplayer gameplay off this weekend at TwitchCon in Long Beach, California, where livestreamers and broadcasters are gathering for a convention.

O’Brien will appear at Netmarble’s TwitchCon booth this afternoon as part of a Twitch livestream.

At TwitchCon, streamers will take the Esports Stage for a 30 vs 30 Fortress Siege, a battle between two clans to conquer a fortress in Lineage 2: Revolution. Next year, Lineage 2: Revolution will add a 200-person Castle Siege mode, where 50 players defend a castle against 150 attackers. The mobile version of Lineage 2: Revolution is based on the popular PC online game Lineage 2.

Lee said Netmarble’s Los Angeles division and its newly acquired Kabam Games studio in Vancouver have worked for as long as a year now in localizing the game for the West. It will be available in English and numerous European languages on November 15.