what was the name?

i’m looking for this bl/yaoi webtoon/manhwa/manhua about this really beautiful prince who caught the attention of the neighbouring prince/king at a ball and then king proceeds to “buy” him for one night and they did the thing, the king promised him that after only spending time with him for that one night he would forget about him. but then in the near future that neighboring king attacks the prince’s kingdom and so he had to seek refuge in the king’s country. the king offered his help for the prince but apparently later on we found out that it was the king’s doing all along just so the prince would go to him. (the king imprisoned him and he was obsessed and possesive of the prince)