我是路人却爱你最深
[wŏ shì lù rén què ài nĭ zuì shēn]
'Wo Shi Lu Ren Que Ai Ni Zui Shen' means 'I am just passer-by but love you most deeply.' This indicates a secret, deep and perhaps one-sided affection. There's some sorrow and tenderness hidden inside such kind of nicknames.