Matthew had a weird friendship with Jiwoo. He would call her or go to her house in the middle of many nights, but she had agreed to this. But why had she agred to it? Because she is in love with him but she knows he doesn't feel the same way. Except that he does feel the same. So why does he find it so hard to express these feelings? Because he doesn't want to put his friendship with her on the line. He knows her feelings about him but he is affaid of losing her. 

jiwoo falls out of love.