疯子装傻
[fēng zi zhuāng shă]
It means 'Madman Pretending to Be Foolish'. On one side, it can represent the complexity of personality, sometimes mad, rebellious yet deliberately simple, naive; On another side, maybe just playing along, choosing silence and non-action under crazy circumstances. Generally it implies both madness and innocence within, adding ambiguity or playfulness to this person's online image.