死性不改本性难移
[sĭ xìng bù găi bĕn xìng nán yí]
It means 'hard to change one's true colors/nature'. The individual who takes up this screen name may wish to express they are aware of some of their faults yet feel these traits belong intrinsically to them making them hard to modify. Could refer to bad habit/persistent attitude/immutable personality features.