I'm not someone that has watched a lot of kdramas in my life, but I've just made an account to rate the Kdrama a 10. I don't think there will ever be a time in my life, where I will be as happy while watching a series as it was with this series.
There may be people, who will try to analyse and compare this Kdrama to other Kdramas, but as a casual viewer I highly recommend this one!
This show is truly one of a kind.