Overall: I enjoy a series with a different premise, but unfortunately the writing/world building/pacing did not work for me. 12 episodes about 50 minutes each. Aired on iQIYI. Re-aired on Studio Wabi Sabi YouTube channel.

Content Warnings: past death/grief, dub/non con touching, 10 year age gap with a highschooler*, manipulation

Watch suggestions: unless you enjoy very slow pacing, characters doing nonsense things, a bunch of crying and untold flashbacks here is my suggestion
1. Watch episode 1, at the end tell yourself that Ongsa died
2. pretend that Suansoon goes back in time and tries different things like having Ongsa avoid that location/day/time but none of them work, so then he tells Ongsa to not meet him at the movie theater
3. Ongsa ignores him, watch episode 7 (basically a retelling of episode 1 from Ongsa's perspective)
4. watch episode 8 where Ongsa learns the only thing to do is for them never to meet when in high school
5. Ongsa time jumps to the present, start watching episode 11 at 19 minutes (although there is a cute high school moment at the very beginning of episode 11)
6. Watch episode 12

What I Liked
- mysterious vibe/present
- how what happened in the first episode related to later episodes
- sweet moments
- Karn (Dear Doctor I'm Coming For Soul) in ep 12

Room For Improvement
- character actions didn't make sense, if Ongsa had actually died and then Suansoon went back and told Ongsa not to drive that day and he didn't but still died and we see Ongsa repeatedly going back trying to change things that would be interesting (like The Butterfly Effect) however Ongsa wasn't even dead and instead of being by his partner's side Suansoon started a romantic relationship with high school Ongsa in the past...
- *age gaps generally don't bother me but the adult Suansoon actor is 36 and he looked like it, past Ongsa is in high school (actor is 25 but looks much younger), it was very uncomfortable to see the adult Suansoon in a romantic relationship with a teenaged Ongsa (who didn't even know that they end up together for quite some time), and Suansoon touching Ongsa when he was sleeping was not romantic but came across as creepy, in general they should have shortened this time and focused more on young Ongsa/Suansoon and older Ongsa/Suansoon
- nonsense stuff, how did no one say anything about a highschooler romancing an almost 30 year old??? why wouldn't in the present Suansoon call Onga's parents/go to their house/look on social media/talk to mutual friends/do an internet search/hire a private investigator/hang up fliers/go to their old hangouts....he just cried
- slow pacing, there was a lot of hanging out in a coffee shop and crying
- a bunch of flashbacks
- really poor world building and a ton of "because the writer said so"