Responses

Yup, he was the who hid Heinly in his room in the eastern empire and sneaked him into the divorce court. They have been colluding to take over the Eastern empire from the start.
Marrying Navier was coincidental, the real reason Heinly and Elgy came to the eastern empire was to sniff out their weaknesses and then defeat them at war.
May contain spoilers to webtoon only readers
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When Navier and blonde hottie (forgot his name LMAO) get married, did Duke Elgy know? cause I think- if I guessed right -there was something in the novel where it said Duke Elgy wasnt surprised or something. (Btw I havent read all the parts, just the chap that builds up to the divorce and I just skipped through most of the parts)