A few people that watched the show stated that the show is difficult to follow due to the crossing between timelines, however I believe it is not difficult to follow at all.

The back and forth jump between years, if followed thoroughly, adds to the story massively and it is what made the drama so nice.

Overall, the acting is amazing, allowing the watcher to be completely immersed in the story from start to finish. It is the type of drama that you would want to binge-watch without getting bored.