I liked the way you articulated your thought in this review. I personally dropped this after 1 episode because, I just could not stand a 70 year old in a 20 year old body dating a 20 something year old. I think thats too big of an age difference. The weird part was the grandpa went into the grandson's body which I found icky personally. I would have given this 4 because the actors were cute but the story wise was not my cup of tea lol.
But in Season 2 good god, the story went downhill.
Random but, I wrote a book:https://www.wattpad.com/story/401229432-a-boy-named-mars