I found some recommendations for novels similar to Romance Killer. Here are the related novels I found for you:
1. Book of Troubled Times by Ji Cha
2. "Spirit Realm Walker" Author: Paper Selling Little Langjun
3. Tang's Table Author: Jie Yu
4. King of the Familiar by Light Spring
5. Fairy Comes Author: Blue Dream
These novels may have some similarities with Romance Killer. I hope you will like them.
The answer is: "OST song" refers to the song in the OST. OST referred to the original music in movies, TV series, and other film and television works, and the song part was the OST song. According to the search results, some OSTs of movies and television works included some songs, such as the theme song of the TV series OST of " A Thought of Passing Mountains," many of Zhou Shen's OST songs, and Yu Kewei's Top Ten Classic OSTs. Therefore, an OST song referred to the song part of the original music in a film or television work.
It's definitely gained a significant fan base. The interesting characters and engaging plot have contributed to its popularity. Also, the way it combines romance and mystery elements appeals to a wide audience.
The OST lineup for the second season of Celebrating Years had already been announced. Among them, Li Jian sang the theme song " In My Lifetime," Zhou Shen sang the ending song " Excuse me," Liang Long, Liu Duanduan, Zhang Haowei, and Guo Zifan performed the promotional song " Aiya." These songs would bring more musical elements to the second season of " Celebrating Years," adding more emotions and atmosphere to the plot.
It's a story that typically involves elements like love, relationships, and perhaps some obstacles to love. Maybe it has a character who disrupts the normal flow of romantic relationships, which is what the 'killer' in the title might imply.