Dangerousness of self-interpretation

Dangerousness of self-interpretation

I got a question like this.

“I live in ×××.
I have spouse visa until 2019-3-4.
Now I divorced.
I should change my visa to business visa.”

“When did you divorce?” I asked to him.
He said, “Two years ago”.

This is the end of the story.

He did not report the fact of divorce to Immigration office when he divorced.
Under current rule, even if his visa is valid until 2019, once he divorces, his visa will be canceled within 6 months.

His mistake comes from his self-interpretation that even if he divorced, he can continue staying here until expiration.

He can’t change his status to business visa, because he is overstay now.

He should have changed his visa within 6 months after he divorced 2 years ago.

There’s nothing that can be done about it now.

Please be careful about it.

Thank you.