It was tough, watching that show. But man, the first ten episodes really got me hoping that it was actually about a time machine watch but I love the twist. It gave me a big insight onto the life of people who've aged. It got me angry so many times that I cried when they disrespected them. One specific moment was when they was an emergency and an alarm was pulled. Everybody was going to the elevator and, sadly for Hye-ja, she was the last one to mount the elevator. It was then too full and had too much weight for it to proceed and every single person on that elevator looked at her, the oldest, but that didn't matter. It didn't matter that they were all young and still had the stamina to be able to take the stairs and let someone who's lost most of their strength stay on. They made her get off in that emergency. I cried a lot on that part. And this whole drama was so beautifully written and the actors were on point that I never wanted it to end. But sadly that's what reality is like. Everything has an ending. We're all living to die.