After quitting work at a royal nature park, 17 moved to Monster Island.
This island is recurringly the goal of poachers who usually go in search of the legendary and unique surviving Minotaurus with the aim of snatching their horns of great value, but all these attempts are thwarted by 17, who works on the island as a ranger (MIR). The Dragon Ball Super manga shows that there are seven Cell Jr.s that reside on the island, which Android 17 has tamed so they don't attack the rangers. It is mentioned that they could have regenerated from the nucleus of Cell's head after being apparently annihilated by Gohan in the Cell Saga.
One night, this ecological reserve was the objective of the Galactic Poachers, who with their ship took all the animals of the island and with it also the Minotaurus, but the plans of this criminal gang were eradicated by Goku and 17.
Later, the island would be under the protection of Goten, Trunks and Marron in the absence of 17 for his competition in the Tournament of Power until it ended.