Based on the name that’s the princess’ father. So the plot (whatever they are trying to do) involves the highest echelon of the country. I guess that’s why the princess is so worried that Seika is just gonna flatten the country had he known more about it (and not have much attachment to people there like her).
The alternate possibility where the princess didn’t reach a compromise and resolve the issue (e.g., didn’t make friends with Seika and was not prepared to do some cover up) will lead Seika to destroy the instigator, finding out more about what’s happening, and making more enemies which he then proceed to destroy them and finding out more, etc. A spiral of destruction, at least that’s my take.