S.D. Codified Laws § 15-9-22
The defendant against whom publication is ordered or his representatives on application and sufficient cause shown at any time before judgment must be allowed to defend the action; and, except in an action for divorce, the defendant against whom publication is ordered or his representatives may, in like manner, upon good cause shown be allowed to defend after judgment or at any time within one year after notice thereof and within seven years after its rendition on such terms as may be just; and if the defense be successful and the judgment or any part thereof has been collected or otherwise enforced, such restitution may thereupon be compelled as the court directs; but the title to property sold under such judgment to a purchaser in good faith shall not be thereby affected.
SDCL 15-9-22