原来我面无表情却爱你很深原来我平平淡淡却爱你很久
[yuán lái wŏ miàn wú biăo qíng què ài nĭ hĕn shēn yuán lái wŏ píng píng dàn dàn què ài nĭ hĕn jiŭ]
This complex phrase can be translated as 'Turns out I was expressionless but loved you deeply; turns out I was plain but loved you for so long.' It describes hidden, deep love expressed subtly over time.