Redirect after the registration

I have 2 registration pages, one for Korean, and one for English. The Korean registration is okay. The page /register is redirect to /checkout page. (registration leads to subscription based) after the registration.

On the other hand, the English registration page /register-eng is supposed to redirect to /checkout/?lang=en page. but after the registration, /register-eng also redirects to the same /checkout page.

Is there any apply_filter function to force redirect my English registration page to /checkout/?lang=en page?

Thanks in advance.