Luna was already having trouble communicating with her sister as she locked herself inside of her room since she came back from Kris' house .
She just did what needed to be done in the house and sat on her couch waiting for her sister to come outside while watching something on a drama website .
She was focused with the drama she was watching , a few episodes and she thought that it was written for her , she related to the heroine of the drama and therefore she wanted to see how she is going to handle her problems throughout the episodes .
And when she got Silin's call, she panicked , which surprised her a lot. She had to calm herself down before going to talk to her.
She cleared her throat, then she immediately answered her call .
The girl was in a hysterical state , she was just saying that she was sorry for calling her .
Therefore Luna just wanted to assure her that it is fine unless her brother doesn't know about this .