Che's life ended because of Nan Xing. Even so, Nan Xing would still smile because it was a promise to the prince. When one prince leaves, another prince appears to protect the fragile princess.
Even if they fall in love in the end, they can't live happily together.
Because an important process is missing.
Falling in love with someone is easy, forgetting someone requires a process, but living together happily requires many tests...