你是深巷里透进的阳光
[nĭ shì shēn xiàng lĭ tòu jìn de yáng guāng]
'Ni Shi Shenxiang Li Toujin De Yangguang' (You're the sunshine seeping through a narrow alley): This metaphorically means a person has become another's unexpected happiness, like rays coming out from deep within the darkness. Implies that this special somebody adds radiance into another life.