故人笑赠的伤疤
[gù rén xiào zèng de shāng bā]
It roughly translates to 'The scar given by a former friend’s laughter,' which conveys complex feelings like bitterness and longing. The laugh might imply memories left behind by old acquaintances; scars signify wounds—be they physical or emotional—that never truly heal but remain part of one's identity over time.