If you plan to watch this movie with the mindset that it's gonna be the typical Korean romcom
this movie is probably not for you!
I went in with no expectations but I enjoyed every second of it.

This movie is one of the most realistic depictions of modern relationships I have ever watched.
Don't expect any grand gestures or a romance that will make your heart flutter.
But despite that and what some other reviews say, it was never boring.
The plot kept me intrigued, while it injected a lot of comedy that made me laugh uncontrollably.

The plot twist was AMAZING, but its not a very vital part of the story I would have enjoyed it, with or without it.
It just introduced an extra layer to the story which I found fun but not ground breaking.

Krystal was so natural in this I loved her character !!!

*spoilers from here*
This movie is more about the emotional needs and expectations within a relationship and what happens if they are not met.
Nobody was a bad person and they both tried to make it work. The ML was not insightful to realise the hurt he caused by the daily stressors that put a huge dent in their relationship. The mundane state of most relationships was not the fault of either of them cause if both people don't actively try to improve it, it could only lead to sourness. The romcom ending would have been for the ML to meet FL at the airport and for them to have happily ever after but it was already too late, the FL realised that the trust was already broken and she already found comfort in someone who meets her needs.

To people who said that this movie was about cheating ... I never though either of them cheated, they just naturally developed a connection with two different people, but if you watch back neither of them had a slight interest in taking things further and developing a romantic relationship with the 2nd leads. Only after they broke up they tried to move on.