I came across this last night and started watching it without knowing anything about it. Initially it gave off a What's Wrong with Secretary Kim -vibe, but then moved to Groundhog Day. Secretary Bai wanted to resign because she hated her boss with a passion but was frustrated by being stuck in a time loop and reliving the same day over and over again. She learns how to anticipate the needs of everyone because she's already lived each circumstance of the day. It's a cute premise, but not well-executed. The sound production is awful! The sound cuts out suddenly periodically, sometimes it becomes loud, and often the voices sound like they are coming from a tunnel. The "special effects" with the elevator were awful. The way it was edited was odd too. Sometimes we saw how she changed things, sometimes we didn't. Quick cutaways that were jarring "oh, I guess we're moving on". It really felt like I was watching a movie of an amateur that had some free time and just decided to make a movie.

The ML was a complete narcissistic jerk. Apparently, he acted the way he did because he's liked his secretary all this time...sure, it makes sense to make her life a living hell, that'll prove you like her.

I do have to say that the last 10-15 minutes of it are cute, once his true feelings are known.