Harley Quinn Season 4's attempts at heroic arcs have done a disservice to its supervillain characters and its overall tonal identity. Harley and her ex-boyfriend, the Joker, have undergone many life changes since they separated in the first season. But in Season 4, the two villains had a change of heart that has compromised the show's narrative.
Source：https://www.cbr.com/harley-quinn-season-4-shines-when-it-ditches-the-heroism/
