I misread the timetable of today and got up early to the campus, waited for a long time in front of the classroom, only seeing no one waiting for the class as me. After a couple of time, i realised that the seminar of Online Journalism should begin at 2pm rather than 12pm!! And because of some emergent situation, the time for the class will shift to 3pm today.
The lesson is, always keep an eye on the schedule or you will mess up your day!!