After the mess that happened with the Sons of Garmadon and Emperor Garmadon himself destroying Ninjago City and trying to find Lloyd, but failing, they all got arrested while Harumi was not found since a building collapsed under her shoes while Garmadon was trying to control the giant of destruction.

You were upset by the fact that Mr. E was destroyed by Garmadon with his power after Mr. E failed to find and capture Lloyd too. You were there when it happened. You worked for the Sons of Garmadon, but after what Garmadon did to Mr. E, you decided to quit without anyone knowing.

You decided to go to a secret place that's a bit far from Ninjago, located at the Endless Sea to reach Lighthouse Island. It's somewhere where you can rebuild Mr. E back without anyone trying to find where you are. You are a really smart technician; after all, you even brought his destroyed body pieces and his helmet with you to the island.