One possible reason could be distance. If they were separated by a large geographical distance, it might have made it difficult for their relationship to thrive and eventually led to sadness.
External circumstances such as career choices could also play a role. Maybe Park Hae In had to pursue a career opportunity in a far - off place that required a long - term commitment and they couldn't find a way to make the relationship work alongside it. Or perhaps there was pressure from their respective friends or colleagues that influenced their relationship negatively.
A third element might be betrayal. If the person Park Hae In loved was unfaithful, it would surely make for a very sad love story. This kind of betrayal can shatter one's trust and love, leaving behind a lot of pain and heartbreak.
There could be a situation where Young was in love with Park Hae In but for some reasons like family opposition, differences in social status, or Park Hae In having feelings for someone else, the love story turned sad. For example, if Park Hae In was from a wealthy family and Young was not, the family might have tried to keep them apart, leading to a lot of pain and sorrow for both of them.
His on - screen presence plays a big role. Park Hae In has a charm that makes the audience care about his character. In a sad love story, we as the audience are invested in his character's journey of love and loss. We feel sympathy for him when his love is unfulfilled, and this emotional connection is what makes such a story appealing.
Perhaps Park Hae In is a private person and their sad love story has not been made public. Without more details, it's hard to say much about it.
Maybe in a story, Park Hae In's character loves a woman who is already engaged to someone else. He has to watch from the sidelines as she prepares for her wedding to another man. He tries to suppress his feelings but every time he sees her, his heart aches. Eventually, he decides to leave the place to forget her, but the pain of unrequited love stays with him.
One possible reason could be jealousy. If either A or J was a jealous person, it might have caused problems in their relationship.
One reason could be that the partner doesn't fully understand the challenges of being with a blind person. For example, they might not be patient enough when the blind girl needs extra help. Another reason could be external factors like family or society not accepting the relationship. Just like in some cases, families might oppose due to the girl's blindness, thinking it will bring more difficulties to their family or their son.
One reason could be family opposition. If the families of the boy and girl don't approve of their relationship, it can put a lot of strain on them and lead to a sad end. For example, if they have different religious or cultural backgrounds that the families can't accept.
I'm not sure which specific 'Young Park Hye In' you are referring to. There could be many people with those names. But generally, a sad love story might involve unrequited love. Maybe Park Hye In loved someone deeply, but that person didn't feel the same way. They could have met in a place full of memories, like a park where they used to walk together, but as time passed, the relationship faded away, leaving Park Hye In heartbroken.
It could be that Alan was betrayed by someone he trusted deeply. A friend or a business partner might have let him down, and this betrayal would make him feel sad and lonely, as it shatters the trust he had in people.