A bright star and its faithful and sparkling shadow

There are times when life fills you with surprises, wonders, tragedies, even inexplicable events but in this case Nae-Yoon is a girl who is sometimes extroverted but hides a past and a present whose facts make her keep a smiling "mask" in front of everyone and hide her true feelings, that is until So-Rak came into her life. How did So-Rak change Nae's life? Will Nae continue to hide her true emotions and feelings now that So-Rak came into her life? What does it hold for both of them and how will they complement each other, or in this case So-Rak to Nae?