I didn't really understand the first one therefore I don't like it as much as the others. The match was quite interesting though.
The second one had a weird plot twist but I enjoyed watching it I guess. The third one is probably my favorite, it was a bit funny and entertaining and the fourth one was kinda sad but I liked it a lot too.
The acting was really great and IU looked really stunning ^^
Other people say they liked the 2nd one the most but in my opinion the 3rd and 4th ones are the best.