Beryl I believe the story is about He Liang trying out King Glory (the name of the new game according to google translate) and discovering that he excels at it, so on with his journey of becoming an expert player. As for the younger brother, he too is trying to become a professional gamer, its just that the game he would specialize in is not mentioned in the synopsis.
This is just my speculation, but looking at a logical pov, I think the younger bro is gonna end up a professional King Glory player together with the older bro, and story is gonna end up along the lines where the two brothers start to compete against each other in the game to see who ends up at the top.
+Also not too sure if the new story is set in the same universe as TKA cause the game's name sounds very similar to the original one :P