This should be a sad story. He and she failed to meet at the right time, reunite at the right age, or even find the right time to express their feelings.
But this may not be such a sad story. They didn't live together or die together. Fortunately, they were able to share the same cave, so they didn't have to be alone.
The story of Yun Shiyan, the leader of Thousand Faces Killer, and Qu Xiaoer, the "Tao Zhu" of the time, is slightly sweet and slightly sadistic. Their main drama is in my novel "Blood Test", friends who like it must go and read it~