This game is a Chinese scam.
I played this game many years ago, I spent hundreds of euros in the game for skins I recently downloaded back this game and as predicted there are 3 different type of in-game currencies. One you obtain while playing that is completely worthless. One that you exchange for real money and can realistically only be for buying a recurring battle pass since all the skins you could purchase with that currency is outdated or lootboxes. The last one, is the biggest problem and it is that currency that is locking away all the newest content including keys you will have to purchase with said currency separately after purchasing the loot box from above. To get this currency you have to leave the apple and western system, that’s right this is straight up a scam and as Chinese as it could be this game has been littered everywhere with pop-up ads as soon as you launch the game, obnoxious tabs about shop everything about this now is about getting your money. Don’t be like me spending above 400 in a game, reporting bugs that never get fixes because it was fun and think they will improve, especially if it’s Chinese they just blow it all to get even scummier instead of better that’s just how they all end up. I had the same experience with that app called Webnovel exact same stuff happened. Hard lesson learned, never spend on Chinese apps.