Whether it is Danjong or Sejo, the paradigm of Jeong Do-jeon versus Yi Bang-won clashes once again.

If we go with Danjong, it represents the supremacy of ministerial power over royal authority.
If we go with Sejo, it represents the supremacy of royal authority over ministerial power.
In modern terms, the former is a parliamentary system and the latter is a presidential system.
In reality, Sejo hollowed out the State Council (Uijeongbu)
and conducted state affairs through the Direct Reporting System of the Six Ministries (Yukjo Jikgye-je), practicing a "direct administration" style.
He believed that since he established the nation himself, he could not be a puppet king.
The character 'Jo' (祖) is attached to Sejo. This signifies the re-establishment of a second kingdom.
In modern terms, it is similar to saying the first republic ended and the second republic began.
Since there are seven kings in Joseon with the suffix 'Jo', it is as if there were up to a seventh kingdom.
For reference, they were originally Yeongjong and Jeongjong.
Later, Heungseon Daewongun Yi Ha-eung elevated them to Yeongjo and Jeongjo.