Responses

Ya like Melo said, Schneider (first mentioned and shown in ch 4 and then in ch 64 and 65) is the second prince and last time around he became king (probably thanks to Ianna's military prowess) and was therefore Arhad's enemy. He marries Lilitte Tarwitt (the lady from the carriage in ch 64) who became queen during her last life, and apparently Ianna (according to ch 65). Tbh tho I feel it might've been mistranslated and that Ianna never married him. Either way, Ianna dedicated her last life to Schneider.
FINALLY, they mentioned Schneider after a long ass time. Been waiting for that man to come and stir the pot. I'm sure Arhad hates his guts since Ianna swore loyalty to him and, according to ch 65, even married him. I LIVE for that kind of drama