Just like everyone has a secret, big or small. Everyone has a scar, deep or shallow, with a thick layer of camouflage on its surface. During the day, pretend it doesn't exist. When you're alone late at night, expose the wound and touch it gently.
For Shu Luo, Xiao Yixuan is the secret that she will always keep in her heart, and it is also the scar that she cannot bear to open in pain.