If you have seen NGNL you know then that these couple were the pole of the comedy in it, their interactions were super fun and here they just raised the bar a notch and successfully delivered.

The mini series was super fun, it has a duration of a movie and they used every single minute well, acting was good, even the cringe parts were watchable and that's a good point.
We got to see the web novel everyone was talking about in NGNL and the perfect life Jayeon dreamt about, and the scene with her father sent a direct arrow to my kokoro!

What I didn't understand was the switch from YooJin to SangYi, I mean I know that Jayeon and Hajun (SangYi ver.) were end game IRL but the point in the story IRL where she had the accident and dreamt of the whole thing they were still enemies, The Real life Hajun was still the hater and she told him to go die just a few minutes ago, so it came off weird and odd that she fantasised about him.
Also due to that, now the scenes in NGNL was slightly changed or adjusted to fit her dreams, she was never "relieved" that he didn't actually die because of the truck, yes she didn't want him to die but she didn't say that she is relieved nor did she smile at him in the original series which would change the whole thing, because the first time Hajun saw Jayeon smile IRL and started to have feelings for her wasn't in the hospital so this kinda shift a lot of minor moments from NGNL that they could have skipped easily.

Overall abd despite the one point I mentioned this is very good mini drama that is very enjoyable and re-watchable.