I'm not entirely sure specifically as there could be various themes in it. It might be about a character's unique journey, perhaps with elements of mystery, action or personal growth. But without reading it, it's hard to say precisely.
Another option is to check with local libraries. Some libraries have sections dedicated to international literature or manga/light novel collections. They might have a copy of 'hitori no shita light novel' that you can borrow and read. If your local library doesn't have it, you could request them to acquire it.
Most of the scenes of the TV series "If Running is My Life" were filmed in Huzhou. The crew filmed in Huzhou's Changtianyang Marsh Park, South Taihu Villa, Huzhou Wuyue Square, Zhejiang Xinda Hospital, Huzhou University Affiliated South Taihu Hospital and other locations.
There were emotional scenes in The Running Detective. In the search results, a short review mentioned that there were no emotional scenes in the drama, but other search results mentioned the interpersonal relationships of the main characters and the emotional interactions between the characters. For example, Han Yunshu was described as a calm and neutral investigator, but she also had her own principles and emotions. In addition, Jiang Ho-Joon's character was also mentioned. He was described as a righteous and impulsive character. Although there was no detailed description of the specific emotional drama, it could be inferred that there was a certain degree of emotional drama among the running investigators.
The TV series "If Running is My Life" was filmed in Huzhou New District, and 70% of the scenes were filmed in the new district. Some of the filming locations included Changtian Park, South Taihu Villa, Huzhou Wuyue Square, Zhejiang Xinda Hospital, and South Taihu Hospital affiliated to Huzhou University. The play was adapted from the novel If Running Is My Fate, which told the story of two families facing life in adversity after a car accident. In addition to this drama, Huzhou New District also attracted the filming of other popular films and television dramas, such as People by the Canal, Hou Lang, Detective of the Republic of China, and Vast Future.
One interesting story could be about a player who discovers a hidden path in the hitori kakurenbo game. This path led them to a special area where they found rare items that helped them progress further in the game.
The 'isekai de tada hitori light novel' could potentially be about a solitary adventure in an isekai world. It might follow the journey of a character who finds themselves alone in a strange new world, perhaps facing various challenges, making new discoveries, and growing as a person while dealing with their solitude.
I don't have information about the author of this 'isekai de tada hitori light novel' at hand. You may need to search for it in specialized light novel databases or websites.
Since I'm not familiar with this specific 'kyuukyoku shinka shita light novel', I can't tell you who the author is. It could be an indie author or a part of a small - press publication. You could try reaching out to light novel enthusiasts or checking with local bookstores that carry a wide variety of light novels to see if they know anything about it.