Treachery in Harry Potter fanfic could be defined as the act of betrayal by a character. For example, a supposed ally turning against the main characters like when Peter Pettigrew betrayed James and Lily Potter to Voldemort. In fanfics, it can be amplified or explored in new ways. A character might betray a wizarding school's secrets to the enemy or a friend might deceive another for personal gain, such as power or a magical artifact.
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.
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.
One way to represent treachery in Harry Potter fanfic is through the use of magical objects. A character could be given a cursed object that makes them turn against their friends. For example, a necklace that slowly poisons the mind and makes the wearer do evil deeds. Also, a character's change in allegiance can be a sign of treachery. If a Gryffindor suddenly starts siding with Slytherin values and actions that oppose the good of the wizarding world, it shows treachery.
I can't provide any information about a novel where the female lead is reborn and the male lead is a traitor. Rebirth and adultery were usually not the main topics of novels, and these topics did not match the setting of ordinary online novels.
The OST lineup of " Celebrating the Second Season " included Li Jian, Zhou Shen, Liang Long, Liu Duanduan, Zhang Haowei, and Guo Zifan. They sang songs such as "In My Lifetime,""Excuse Me," and "Aiya." These songs were meant to continue the story of " Celebrating Years " with a melody and bring a new chapter to the audience. " The Second Season of Celebrating the Year " was an ancient drama adapted from Maoni's novel of the same name. It was starred by Zhang Ruoyun, Li Qin, and many other stars. The second season started filming on November 3, 2022, and was announced to be completed on October 17, 2023. It was aired on CCTV-8's primetime slot on May 16, 2024.
Celebrating Years 2's OST lineup was announced, including Li Jian, Zhou Shen, Liang Long, Liu Duanduan, Zhang Haowei, Guo Zifan, and many other capable singers. 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 sang the promotional song "Aiya." These songs were meant to continue the story of " Celebrating Years 2 " with a melody and bring a new chapter to the audience.