Dying Light: The Following is a single-player campaign DLC for Dying Light (2015). The DLC concludes the story of Kyle Crane, the player-protagonist during the game, which originally began in the base game. Instead of the base game's pre-determined narrative, The Following's story ends with a critical choice left up to the player. Depending on their actions, the possible Dying Light endings wildly diverge.
Source:https://www.cbr.com/which-dying-light-ending-is-canon/