青青子衿o悠悠我心
[qīng qīng zi jīn o yōu yōu wŏ xīn]
Based on classical poetry, this nickname - 'Qing Qing Zi Jin, Ou Ou Wo Xin', suggests a pure admiration from afar. 'Green Collar' usually describes a learned or scholarly person, and this title reflects the speaker's heart longing for such a figure.