习惯微笑掩饰自己的伤
[xí guàn wēi xiào yăn shì zì jĭ de shāng]
It conveys a person who has developed the habit of hiding his/her sorrows or pain by putting on a smile, showcasing a protective front to avoid letting others see the true self. This implies both an element of emotional resilience and a mask of social protection.