Thank you very much for sharing this video!! It's very interesting to hear Seungyeon's perspective on the topic. And she did so well speaking without notes the whole time. Did she have a prompter or something or had she memorized everything?
There're some prompters maybe like other speeches, however, as you can see in this video, she gazed at the audience almost the entire time during the speech. So, it looks i thought she memorized everything and sometimes checked them. Since her words were derived from her experience and feelings, it might have helped her perform well.