The storyline started off great for the first 5 episodes. I was thinking "Wow this is great, I am invested in this" Then for some reason, it took a nose dive and I ended up fast-forwarding from episodes 8- 16.
Reasons:

1) I saw and felt ML love and obsession for FL. He was too into her if you ask me. Every time he saw her name, saw her, she called him or she seemed to be in trouble he would drop everything and go with her or stalk her.
Kind of weird how a cute/attractive teenager and adult never likes or has a crush on another woman in all that time.
Anyway, I felt his love for the FL. He portrayed the love, obsession, and angst very well.

2) The FL lead did not portray the love nor I don't think she said it ( as far as I can recall from all the fast-forwarding I did) that she loved the ML. She said she liked him a lot during the college time frame I believe and he said " I love you" but I never heard her say she loved him.
She treated him as if she was still just a fan, just like him as a fan, and wanted to, of course, save him from being killed. The FL portrayed the crying emotions, worry, teenage crush on that 2nd ML, and anxiousness to find the killer very well. But, to my eye and feeling she did not seem to portray the love it seems they were trying to portray she should feel even in the present time frame.
She did not show angst/yearning for ML when they could not be together or were apart. It was like they have cutesy moments, she gets distracted with a shiny ball/interest, and then she puts him out of her mind. It is the ML who is constantly making an effort to contact her to stay in her orbit.

3) Also why does she still seem like she has only the thoughts/experiences of a teenager when she went back in time as a late 20's/30 year old. I know she was in a wheelchair for a while etc.. but her hearing/seeing and experience of human experiences should not still be of a teenager. Romantic relationships yes, she did not have those experiences in the present time. I don't know. It frustrated me how they wrote the FL lead lines and how she acted it out. Did she put her " savior" ML on a pedestal as an adult when she was a fan and did not have romantic fantasies about him? I know she was in a wheelchair and did not think it was possible to date anyone, but most female fans still have romantic notions about male celebrities. That is where her " liking' him should have a head start in the feelings moving on to love when she goes back in time with all her memories and feelings intact.

4) Also are they trying to say that teenage FL and adult FL switch places in the same time frame when the adult version goes back to being a teenager? Like the same day? That is why she dated and still has a soft spot for 2ML? They could have kept that just as friendship and developed her feelings for ML even more. It just made it weird/icky that she kept hanging around ML, while dating 2ML and ML did not mind ( actually sought her out ) doing activities together knowing she was dating 2ML.

Anyway, it was okay, I don't get the hype. I am waiting for the ML to have a costar who complements him well as his partner and gives their all. Strong Girl Book Soon (or whatever it is called) and this one, did not have a good FL chemistry and or storyline.