微笑只是一种漠然
[wēi xiào zhĭ shì yī zhŏng mò rán]
In this nickname 'A Smile Is Just Indifference', smiling merely acts as a mask hiding true feelings or indifference on one's face. People choose to smile at everyone, yet it does not represent happiness inside; it may be because such a person has experienced much and seen things through clearly, treating everything in a calm and indifferent manner.