I don't know whether the feeling of separation is bitter or sweet. I only know that the sorrow, reluctance, bitterness, and sadness in my heart are getting more and more, slowly accumulating. Tears are rolling in my eyes, but they don't fall. The pain of wanting to cry but not being able to cry is gradually adding up. I don't want to leave, but I can only say goodbye. Human feelings are like this. You don't care when you have them. Only when you lose them do you know how to cherish them. Only when you look at the back of you leaving can you truly understand the preciousness of friendship...