I'm not sure specifically what the 'shin jae ha girls love story' is about as it could be a very specific or personal story. It might be about the love experiences of girls related to someone named Shin Jae Ha.
The main characters in the 'shin jae ha girls love story' are most likely the girls themselves. There might also be other supporting characters such as friends, family members, or potential love interests. But without more information, it's all speculation.
One common theme is adventure. Since the original story has a lot of adventure elements, fanfics often continue this. Yona and Hak go on quests together, facing enemies and exploring new lands, which strengthens their bond.
One popular 'Yona of the Dawn Yona x Hak fanfic' is 'The Journey Ahead' which beautifully explores their relationship as they face various challenges together. It has great character development and a lot of sweet moments between Yona and Hak.
Yes. The Yona of the Dawn manga has ended. Although it might be sad for fans, it left a memorable impression with its engaging plot and characters throughout its run.