Sinb saw Yuju and Umji entering the school and decided to surprise the two. Sinb was secretly following them when the diary fell.    

        Sinb pick it up and about to call Umji and Yuju but a paper suddenly fell from it revealing a letter address to her. A letter from her bestfriend Sowon.

       Sinb was so confuse upon reading the letter, at that moment Yuju and Umji have notice her and goes to her.

"Did you somehow knew about this?" Sinb asked the two

Yuju and Umji looks  at each other confusely

This letter..do you know about this? Sinb asked again

The two then realize what is happening..

"Im so sorry Sinb"..that is what they can only say to her

"I think if there is someone you need to ask right now its Yerin unnie" Yuju added

     Sinb return the diary to Yuju then immediately walks away from the two to look for Yerin while holding the letter she just discovered.

     It feels like a deja vu, Sinb holding a letter again and looking for Yerin but this time its with anger and confusion.

  She needs to know the truth at that very moment and thats why she desperately looks for Yerin.

    Yerin was happily chatting with her classmates when Sinb suddenly grabs her wrist and takes her somewhere.

 Yerin was so scared of Sinb that time.

"Sinb ah.. what's wrong?" Yerin worriedly ask

"Tell me the truth Yerin" Sinb said

"Are you really the one who