Derailment is such a interesting drama that kept me hooked with every episode, and now I feel so sad after finishing it. The ML and SL were absolute eye-candy to start off with, like QL was a red flag to start off with but then progressed into a green flag idk. Watching the character development of JXY from an arrogant person with a sense of superiority to a genuine person who works hard was very worthwhile. I also enjoyed the aspect of how romance was rather a side focus, with mystery/thriller which made it very exciting. By unravelling all the mysteries as to what exactly happened to the FL, and who is behind it all with limited clues, while meeting many people to form her the support system JXY never had, easily gives this drama a 9/10. I didn't feel like this drama dragged or that any of the arcs were unnecessary, and I feel like this was quite well put together. The only minor issue I had was with the expression of emotion and relatability in the actors, I feel like some scenes came short of what they were supposed to make the audience feel. Overall, I thoroughly enjoyed Derailment and rate it a 9/10!