Xia Lan

The first season was made in 2012, which is very uncommon for VAM animation back then but still much more real than many anime.

Season 5 shows how carefully they put into an undercover character. It is neither magic nor wuxiang but they carefully explain each character's capability for viewers to estimate.

Season 7 is mind blowing, it's like watching season 1,2,5,6 all at once. The narrator carefully adds some new characters to maintain the main cast while evolving the story. There is no antagonist, there is only perceived antagonist. I believe even Thanos' quest is meager to this.

And best movies always employ one or two ost, yet unforgettable.