At this point I won't be surprised if he skipped the ring and ceremony all together and had her sign a contract then and there,setting up a tent outside the government office to file it at 12am the day he turns 18.
This is irredeemable. Cute art, but the story is way too much for me. There is no way any of this will have a good bending unless the crown prince and all his friends mysteriously fade away into the night never to be seen again.
I honestly don't get characters that purposefully interfere with their "loved ones" happiness. FFS the girl has a job she loves and is in a relationship with a guy she adores, WHY try to take this away from her?!