If you like c-drama and have not watch this yet, I would suggest you go and watch this! I think this is one of the best ones out there. If you like sci-fi mystery type of story, I would strongly suggest you watch this one. There has been so many reviews about this drama and most have mentioned what's so good about this drama. Although I'm not normally a fan of sci-fi or time travel stories, the reviews piqued my curiosity. I originally thought that I will be confused and bored and will write a not-so good review about this drama. But, boy oh boy, it does not disappoint! The drama is so intense that it keeps you at the edge of your seat most times. Each episodes dived deeper into the story and provides more context and background on the event (bombing of the bus) and the characters of the people on the bus. I like how they reveal bits and pieces at each episode and how it all connects at the end. The drama also deals with issues facing modern society almost everywhere (which is rare for c-drama), so I applaud this. The acting of the younger actors and actresses and the more mature ones are really good! I also really like the ending theme song (Zhou Shen surprisingly has a very good English pronounciation!)