Why is the ending of the doll a tragedy?

The comic book ending is tragic because the hero and heroine didn't end up together.

According to the broadcast platform Iqiyi, the two experienced various challenges and difficulties in the story of "Dressing dolls in love". However, due to personality differences and some conceptual differences, they did not come together in the end. To some extent, this can be considered as a tragedy. Tragedy is usually defined as the ending of the protagonist's suffering or misfortune, which often causes the audience's sadness and sympathy.