沁青青子衿幽悠悠我心
[qìn qīng qīng zi jīn yōu yōu yōu wŏ xīn]
'Qin green collar, yoyo in my heart' comes from classic poetry, signifying yearning and nostalgia. 'Green collar' was once a symbol for literati, conveying an elegant and romantic sentiment about the pursuit of intellect or love.