Sisyphus is the type of drama where you have to stick with it a bit before you're truly invested. You should go into it with an open mind. There were a lot of "plot holes" or things that were unrealistic but they ended up being explained in episodes 15/16. There are still plot holes but its impossible to include time travel in a show and not have plot holes. One of my favorite things about this drama is the messages it sent. I don't want this review to have spoilers so I won't get into too many details but one reoccurring theme is neglect. Seeing someone in a helpless state and neglecting them. It shone a light on the cold reality of out world. Regret was another reoccurring theme. Humans go back in time to fix their regrets but why make decisions you're going to regret and then go out of your way to fix those regrets. I'm not a big fan of "fate" but I liked they way they presented the concept in Sisyphus. Some of the criticism the drama faced regarded its CGI and it's a fair criticism as it could use improvement in some scenes (some scenes it was fine) but those scenes were such a small portion of the drama and didn't affect the viewing too much. I liked this drama because of the fascinating story that draws you in, it's captivating characters, and of course, the messages it sent.