Are you really Miki?
Are you talking like this after you read all of our comments? I was so disappointed about this, because I was agree with you and some of others too. But you called all of us "腐った日本人"....!!
Yes, the people says bad staff, I don’t like it too. But it is not logical to say that like you. There are many Non-Japanese and Japanese peoples in Ueno station. Why only you? Because you are half-Japanese? Why not other Non-Japanese peoples or Japanese peoples? No. I guess just because you look like a suspect.
You said you were explained "I am Japanese. My name is Miki. I’m hurry up. let me go.". But think about like this, if you are a police and one-day you saw someone was stealing money and run, then the another day you found that person at the station. You asked him ID but he said "I am Japanese. I’m hurry up. let me go." and run away. Do you believe him or just let him go?
I know there are many other staffs when you had bad experiences because of you are a half-Japanese. But please don’t think about it too much. It just makes you feel bad. You could say the police is working well for our safety if you are a Japanese. That is what many peoples says in here.