Four days trip is really short. I am on my way back at the airport again (cannot input Chinese). This time, I saw a lot of friends in the National University. Everything seems to be unchanged. But when talking to me, the supervisors seem to be old friends, not like a senior any more. This is a really nice feeling. Well, the short journey has finished. I am going back. Another good feeling. What shall I expect for the next few coming holidays?