Did no one just thought for a second the color scheme was similar because it has a common root ? I would bet blue was the color of Undead (in games, etc) in Korea before Solo Leveling even existed.
Everyone saying this copied Solo Leveling, but doing some research, in Korea black is used to represent death while blue is used to represent youth and life. So they are using the black-blue color scheme to show the dead have been brought to life. @N2O@FaultyOutlet@IHadToSignUp04 and anyone else who thinks like this is just ripping of Solo Leveling color scheme.