I actually thought the story plot on the whole mysterious tree and love potion was going well (despite super slow in unraveling on background) until I don't know, the writer nim decided to be undecided and butchered the plot. I don't think I have ever watched any dramas that literally left me saying, "So that was it?" even when stories are left for open ending at your own interpretations. Depending on how you are reading into the meanings of what were said by the characters, you can decide whether it is good or bad.

So I tried to reflect back to why I started watching this drama and why I continued watching it at the beginning and I realised it has to do with the light cheesy romance (so sweet you can have toothache type) between the two MCs since this is afterall a first love experience for the male MC. The beginning was really enjoyable for me and even when the theme on mysterious tree started to get a bit heavier, it was comprehensible on what the writer nim trying to convey on curses and love. What not sitting well with me was the mysterious tree theme was not properly integrated into the drama throughout and suddenly writer nim needed to end the story and bam, words vomit and stir fried ingredients hastily for closure. IMO, final ep was a total filler (not sure if this counts as spoiler) with many random scenes compiled together. I would not rewatch or even recommend others to watch unless the person just want to watch something sweet in beginning and don't care at all about story plot. Everything else was just weak otherwise.