So, many people complaning about timetravelling or related to it. Is everyone here timetraveller? Since when was there ph.d degrees for time travelling? Then constant nitpicking minor sci fi scenes. Not a single science fiction show in history is scientifically realistic that why its called fiction. Nobody complains about how in star wars laser beams blowing up ships work. Because you were suppose to suspend disblief anything scientific related. This is Devils deal you make going in watching show with writer. In exchange, you get fun action scenes, amazing story, or realistic characters making hard descisions for situations. This is core you are suppose to criticize and analyze.

It started ok. A redemption story of Han Tae Sul for his brother. They constantly showed flashbacks his brother taking care of him and fully financially supporting him. The regret and guilt for abandoning his brother. However, the writer all sudden gives up on the story and started pushing more romance scenes in ridiculous situations. Like, they go on trip to amusement park to have fun, when they are being chased by people who have cctv control, drones, etc. This is bad writing. You can't just give up on main plot to have fun and put yourself easy target to be captured. Also, how many times has he constantly gone back home and magically escaped from future time travellers and military trained soldiers with cctv and drone control? It became to ridiculous to watch, the writer gave up on main story, and repetitive scenario of them getting caught and magically escaping was boring.