The power level of the monster is depending on it's name color.

White: baby

Green: baby

Yellow: easy

Orange: normal

Reddish orange: a little hard

Red: hard

Dark red: very hard

Purple: hardcore

Dark purple: nightmare

Black: hell

Pitch black: apocalypse

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The power level of the human is depending on progress of stage, And stages progress is apart from the leveling system.

So if your character is for example is level 1 if you level up your character to level 2 you will not get a stat point, your character stat will only stages up after you train the said stats.

For example you will need to run to increase your stamina and speed, and so on.

And example of the stages level up is below this sentence↓↓↓

Example:

Stage 1 needs to reach 3 star to evolve into stage 2 and the maximum of the stages is 9 stages.

And every star need a different amount of exp to add another star(the star system is like a level so it means that stages 1 needs 3 level to evolve to next stages), and every stages evolve, the number of star will reset to zero making it really hard to level up.

And here's the stages and the number of star it takes to level up.

Stage:

1:★★★ (3)

2:★★★★★ (5)

3:★★★★★★★★ (8)

4:★★★★★★★★★★ (10)

5:★★★★★★★★★★★★★ (13)

6:★★★★★★★★★★★★★★★ (15)

7:★★★★★★★★★★★★★★★★★★ (18)

8:★★★★★★★★★★★★★★★★★★★★ (20)

9:★★★★★★★★★★★★★★★★★★★★★★★ (23)