我内心黑暗你是我的光芒
[wŏ nèi xīn hēi àn nĭ shì wŏ de guāng máng]
This nickname implies that despite the darkness inside, the person finds hope and light in another individual. 'You' bring warmth and optimism to an otherwise gloomy world. The contrast between the inner darkness and the light emphasizes a strong dependency on someone special.