影子是时光的心时光是影子的泪
[yĭng zi shì shí guāng de xīn shí guāng shì yĭng zi de lèi]
'Shadows Are the Heart of Time, Time Is the Tears of Shadows' poetically compares shadows to the passage of time and implies bittersweet memories of unfulfilled love, where happiness only exists in the past.