Please provide the transcript. I need the text of the Korean transcript to answer your questions. I cannot access external websites or specific files online, including the YouTube video you linked.
This video is a preview (선공개) of episodes 9 and 10 of a series likely centered around Cheongdam International High School (청담국제고등학교). The preview focuses on a tense conversation between two characters, possibly involving betrayal (배신) and a significant event like an engagement or wedding (약혼식이나 결혼식). A key element appears to be a compromising video (영상) used as leverage.