Why did Obito join Madara ?

Obito's life changed when he was rescued by Madara Uchiha and became his successor in his plan to realize the Eye of the Moon Plan. Initially, Obito cared deeply for his friends, but after being manipulated by Madara, his psyche shattered, driving him to devote his life to fulfilling the Eye of the Moon Plan.

Obito Uchiha emerges as one of the foremost antagonists in the Naruto universe, transformed into a villain following Rin's death at Kakashi's hands. Believing in the path of dreams, Obito dedicates himself to aiding Madara in realizing his ambitions.