The main page of the teaser website says that the game is "Coming Soon" with the logo of BTS World game. The official Twitter now has more than 100,000 followers after it was first opened on Jan 25th.
BTS World is a simulation game featuring the videos and photos of the global idol group BTS from Bighit Entertainment. The game was first introduced on August 2018 at the NTP (Netmarble Together with Press), and Netmarble has announced in the Q3 2018 Conference Call that BTS World is coming on Q1 2019
Netmarble is cooperating with Bighit Entertainment, which is the IP holder, and BTS World will feature more than 10,000 game-exclusive photos and more than 100 story videos. Also, BTS' new song will be used as the OST of the game.
Netmarble is planning to develop another BTS game after BTS World, and has assured that they will introduce the game once they have a solid plan.