I agree with a lot of your points, this was really well written. My disagreement is more because I did like all the characters, I'm a big fan of Kim Hye Yoon, so I'll end up liking everything that she does. But yes, the plot was messy, the 2ML deserved better and there were a lot of very annoying moments. I don't mind silliness and a history not taking itself too seriously, but this was just very messy all around and no well thought beforehand. I completely agree that the time travel lore could have been so much better, with the grandma and everything. I also think that her having a group of girlfriends would have added some more space in the stories and eliminated the love triangle. A lot of missed opportunities with this one.