心深不见底的颓荒众人皆知
[xīn shēn bù jiàn dĭ de tuí huāng zhòng rén jiē zhī]
Expresses a deeply emotional and dark sentiment, describing oneself as having an unfathomable inner depression ('darkness inside') which is ironically well-known by others. It reflects introspection, sadness, and perceived social awareness.