Using my personal rating system of "loved," "liked," "meh," & "nah," this was a “liked”/”meh”.

What I liked:
This was a very interesting concept. As someone who is getting older myself, I often wonder what it would be like to go back in time with an idea of what is to come—what would my life be like if I got a “do over”? In this case, its less of a do-over, but a pseudo reincarnation into a life the ML never had. Like most reviewers (probably), I thought Lee Sung Min did an excellent job as the patriarch/tyrant/dictator of the Sooyang Group. I liked that the ML’s love interest was a strong, intelligent woman who was not the elegant ‘lady’ that was characteristic of the women in the Jin family. I like that they got back together right before the JDJ’s end and the ML realized what was worth living for by that point. As awful as this sounds, I liked that Jin Yang Cheol did not have a dignified end. No one who has done that much harm to his family and country deserves to go quietly into the night.

What I did not like so much:
It got a bit draggy in the middle with all the business maneuverings. There came a dreary cycle of JDJ trying to bring down Sooyang, Jin family fights back, JDJ triumphs again, rinse, repeat. JDJ was intelligent but a lot of his ‘brilliance’ came from knowing major national and international events and having the maturity level of several decades in a younger body—in addition to inside knowledge about the company (albeit some decades in the future). I argue that he would definitely have started influencing the future (YWH’s past) once he started influence politics and business at regional and national levels. So, the argument that he was unable to influence major events was weak. The farther he got out from his ‘entry point’ into the timeline and the more influential he got in national politics, the less he would be able to successfully predict the future.

I did not like (though I understood) the affection JDJ began to feel for his grandfather. I didn’t think JYC was a person who deserved any affection or love. In my mind, the best revenge YHW living JDJ’s life could have had was to make money by investing based on his future knowledge, marrying the girl, and living his best life far away from the Jin family toxicity—like on a beach somewhere. Obviously, that would not have made for very long drama, but simply not giving a d*** about Sooyang when an entire family was literally trying to murder each other over it is the best revenge.

Minor dislike: I wish they would have used a different actor for YHW. He’s only in the first and last episode and then some memories so picking a different actor would not have overshadowed SJK as the ML. OR they should have done the thing where he has a different face when he looks in the mirror or is in photos. The two men looking identical just didn’t make any sense especially since no one seemed to notice.

Other thoughts:
Holy toxic family, Batman! What, exactly, was the point!? They were all miserable. Jin Yang Cheol was an awful person who loved money more than anything. He treated his wife like dirt, cheated on her, and made her raise his son born out of wedlock (and not sure why she put up with it, since she turned out to be strong and clever on her own). He wanted his children to be strong and independent enough to take over the business after him, but he did not raise them to be that way (because if they were, then they would not obey him blindly in everything). His children, with the exception of one, married whom they were told to marry so no one was happy and no one supported each other—even the in-laws hated each other. Literally no one was happy, so what were they all fighting for!?

Obviously I finished this, so it never caused me to drop it in disgust. I love Song Joong Ki so that’s why I started it and it held my interest enough to finish it. I will definitely not rewatch. The suspense is what kept me going and now that my questions are answered…I don't see any reason to go back.