I'm pretty sure that Twice has done almost every concept in the existence of KPOP girl groups (except for maybe super dark, but CFM was pretty close and that's a rather rare concept...)
Teen Crush concept
Summer Concept
Winter Concept (Best Thing I Ever Did too but I prefer Merry and Happy)
Girl Crush Concept (Fake & True and BDZ is also a choice but I prefer Breakthrough and it seems more powerful. If you don't believe me on this one, search up the English translation of the lyrics)
Retro Concept (I also think Signal but Jihyo didn't call Signal retro because she says this is the first retro video they did lmao. I would also say Breakthrough but not as much)
"Dark" Concept (not completely dark, but there is definitely some aspects)
City Pop Concept (kind of like a really retro concept, popular sound in 70's - 90's Korea and Japan)
Fairytale Concept (with like magic, YOY could also be a choice)
Sci-Fi Concept (Fancy could also be a choice but not completely, I mean, this one literally has aliens in it)
Meaningful Concept (don't get the wrong idea, I am not at all saying that Twice's songs are not meaningful because they are but I feel this is the most meaningful title track)
and of course...
Cute Concept because it's one of the main things people use to reference Twice even though they don't really do it anymore.
There are A LOT of mvs that can go with this but I'm just going to do Candy Pop because with the color scheme and most things, I think it's the cutest Twice title track.