Where to sign in
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Students
Sign in with a link sent to your email, with Google, or with the class code your instructor gave you. If you were sent a direct assignment link, that link still works — use it instead.
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Instructors
submit.seongbyun.com/instructor
Sign in to an existing account, or create one from the front page.
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Anyone curious
A sandbox with no sign-in. Try it from the instructor's side or the student's side; nothing you do there affects a real class.
What the assignment site does
The site runs process-aware assessment: spreadsheet assignments that record how the work was built — every formula, paste and minute — and not only the numbers that end up in the cells. The instructor sees the process as well as the answer.
Questions about a specific assignment, a grade, or access to a class go to the instructor who runs that class, not to this site.