There are only a few Kodi addons which achieved a great milestones in very short period of time. Exodus and Covenant are these two addons who tool very less time to be popular among Kodi users. Poseidon is another outstanding Kodi addon which providing great features to Kodi users.
If you want to watch free movies and tv shows in 4K HD without buffering then I recommend you to install Poseidon Kodi Addon. This addon can be installed from the Kodil Repository and here is step by step guide to install Poseidon addon for Kodi Krypton 17.6.