It is revealed in Avengers Endgame, that during the five years after Thanos killed half of all life, Hawkeye (Jeremy Renner) took on a new mantle, Ronin, and went on a rampage on the criminal underworld. It is explained that he was killing criminals because they got to live when good people like his family died in the snap. Whilst Hawkeye seems to have put his dark days as the Ronin behind him, it is likely he had angered a lot of criminals and their families during his rampage. The trailers for Hawkeye show a new character, Kate Bishop (Hailee Steinfeld), wearing the Ronin suit, which could bring all sorts of criminals after her to get revenge on Hawkeye.It is clearly established that Hawkeye and Black Widow were close friends to the point that Black Widow knew about his secret family. Avengers and Black Widow both referenced a mission the heroes carried out together in Budapest that cemented their friendship.Hawkeye, therefore, had survivor's guilt from Black Widow's sacrifice and lost his closest friend.Hawkeye director Rhys Thomas told Insider that this set up the show perfectly, which implies that Black Widow's death will be brought up or hinted at in some way.Black Widow introduced the Russian spy's adopted family outside the Avengers, all of which are still alive and somewhere in the Marvel Cinematic Universe.The post-credit scene in Black Widow set up an opportunity for Yelena (Florence Pugh) to have another appearance Hawkeye.During the scene, Contessa Valentina Allegra de Fontaine (aka Val), played by Julia Louis-Dreyfus, tells Yelena that Hawkeye killed her sister, Black Widow. Yelena is on the cast list for the show which means her clash with Hawkeye is a matter of when, not if.After Avengers Age of Ultron introduced Hawkeye's family and his safehouse home, Marvel has shown Hawkeye as the family-oriented Avenger.That is likely to not change in Hawkeye as the trailer shows the archer spending time with his children. In addition, the description of the show says that Hawkeye is in a rush in order to spend time with his family for Christmas.Hawkeye producer Trinh Tran told The Hollywood Reporter that the idea to set the series during the holidays came from Hawkeye being a family guy and it added tension to the story to see him race in order to spend Christmas with his family.Hawkeye director Rhys Thomas confirmed that the series is set two years after the Blip (2023) in Avengers Endgame.This means it is set later than most of the phase four projects that we have seen so far, including the upcoming Spider-Man No Way Home movie.