Since I don't know the exact yoona sad story, if it's a story about loss, the key element could be the thing or person that was lost. For example, if she lost a dear friend, that friendship and the memories associated with it would be a key element.
If it's a story of betrayal, then the person who betrayed Yoona and the act of betrayal would be the key elements. Maybe someone she trusted with all her heart stole her idea or something valuable from her, which made her feel sad and alone.
In a sad story where Yoona is facing some sort of internal struggle like depression, the key elements would be her own thoughts and emotions. Her negative self - talk, her feelings of hopelessness, and the events that triggered such a state of mind would all be important aspects of the story.
I'm not sure which specific 'yoona sad story' you're referring to. There could be many stories related to someone named Yoona. Maybe it's about a character named Yoona in a movie who faced a lot of hardships like losing her family in a war and had to struggle to survive on her own. But without more context, it's hard to tell the exact story.
One of the key elements is the sequence of tragic events. First, there was the accident during the mission where Obito was severely injured. Then, Rin's death which was a huge blow. Another important element is his relationship with Kakashi. The misunderstanding between them regarding Rin's death was a major factor. Also, his own sense of being a failure due to his physical state contributed to his downward spiral. All these elements combined to create his very sad story.
One key element is unrequited love. For example, Dracula might love someone he can't have, like a human who is repulsed by his vampiric nature. Another element is loneliness. Dracula is often alone in his castle, surrounded by his dark existence with no real companionship. Also, the loss of his former self. Before becoming a vampire, he might have been a different person with hopes and dreams, and now those are all gone.
One key element is the high hopes or big dreams of the specialist. For example, if a scientist specialist aims to find a cure for a deadly disease but fails, it creates sadness. Another element is the personal connection. If a music specialist has a deep emotional bond with a particular instrument or piece of music that gets damaged or lost, it leads to sadness. Also, external factors like lack of resources or support can be important. If a sports specialist doesn't have the right facilities to train athletes and they lose important competitions, it can be a sad story.
The main character's loss is a key element. For example, in the story of Lily and her dog, the loss of her beloved pet was the central cause of her sadness.
One key element is loss. It could be the loss of a dream like Sonaze losing her hope of being recognized as an artist. Another is betrayal, such as when a friend leaves without explanation. Also, heartbreak in relationships, like when a loved one turns away, is a common element.
One key element is his past in a rough environment. Growing up in a place with drugs and a wild street life left a mark on him. His music shows that he has seen the darker side of life early on.
One key element is his appearance. Being tall and slender with no face makes him very eerie. Another is his lurking nature. He hides in the shadows waiting to frighten or harm. Also, his association with dark places like forests is important.
In the 'drift sad origin story', the environment could be a key element. For instance, if the story is set in a post - apocalyptic world, the harsh environment forces the characters to drift. And the constant struggle for survival in such a desolate environment makes them sad. Also, the lack of a sense of belonging can be important. A character who doesn't feel like they belong anywhere is more likely to drift and be sad about it.
One key element could be their physical transformation. Foxy and Mangle have changed from their original forms into something more menacing or broken.