This drama is really a hardcore one. It forcefully tells us that time is not something you can just mess up with. You can use and do everything but still ends up with the same conclusion. It is an endless loop, a never-ending cycle.

Have almost watched every dramas with Time-Slip/Time travel concepts. Be it in Korean, Japanese, Chinese, Thai, Taiwanese, etc. Just name it ? Actually it's one of my favorite genres in dramas since it often requires analyzation and thinking when you watch them.

Someday or One Day is that specific drama which has a solid storyline and well-detailed plot. Others may have tragic loopholes that will leave the viewers hanging but this one has successfully closed all of its loopholes by using mind-blowing plot twists. You thought you're already correct in one part but it's actually not and I am one of those victims.

We all know what's Butterfly Effect in time travel concepts and SOD has carefully laid and emphasized it all throughout the series.

The characters played their roles perfectly. A cassette tape recording that started everything is not your usual thing. The soundtracks are so beautiful such as SHI SHI's Someday or One Day.

I won't give any spoilers so I don't know what you are waiting for. Just start watching this OUTSTANDING DRAMA and find it out yourself if it's good or bad. ?