What do you mean that love will eventually end in the isolation room?

Nanqiao is not with the princess, although they love each other so much. But their love is very touching. After being awarded the Medal of Warriors by King Visa, Nanqiao left Scarlett and the princess. The princess became a blood-red Chu Jun, and was about to inherit the throne. Due to the disparity in status and the bondage of responsibility, two lovers who deeply love each other can't be together, but their love for each other remains in their hearts forever, further aggravating each other's pain, so I think this ending is not very good. But this love is very sad!