What year did "Attack on Titan" Season 2 begin airing?

Attack on Titan Season 2 began airing in 2017. The highly anticipated season arrived four years after the release of the first season, due to a delay in the production process. Fans were excited to witness the continuation of the intriguing storyline and explore further the mysteries surrounding the epic battle between Titans and humans. The second season delivered intense action, captivating plot developments, and unexpected revelations, keeping viewers thoroughly engrossed throughout its run in 2017.