A marriage is null and void if it falls under any one of the following subparagraphs: <Amended on Mar. 31, 2005>
1. Where there is no agreement to marry between the parties;
2. Where the marriage is in violation of Article 809(1);
3. Where there exists or existed between the parties the relationship of lineal relatives by affinity;
4. Where there existed between the parties the relationship of lineal blood relatives of adoptive parent line.[Inconsistency with the Constitution; 2018Hun-Ba115; Oct. 27, 2022; Subparagraph 2 of Article 815 of the Civil Act (as Amended on Act No. 7427 on Mar. 31, 2005) is inconsistent with the Constitution. Those provisions shall continue to apply until such provisions are amended, not later than Dec. 31, 2024]