Sahan Diwan is a premade Sim from Lucky Palms. He lives with his parents Taj and Zahra. His family has just recently moved to the deserted area of the town where his father is given duty to investigate the drained lake at the area. Sahan, however, dislikes the idea of moving to a desert town. He'd rather live in a big town with a big swimming pool, according to his bio. As a result, he and his father dislike each other. Meanwhile, his mother is very supportive to his father's job, and she seems to have neglected him as Sahan and Zahra have become distant friends.
Sahan found a lover in the town, Piper Sparks. Both of their biographies imply that they don't like to live in a deserted town, and both of them hate their workaholic fathers. It might suggest that they'd want to move out to a bigger town together, though it's up to player's imagination. He's best friends with Ethan Tanner, who is good friends with Piper.
Oddly, when the Sparks family is first played, Piper has the "First Romance" moodlet, but Sahan doesn't. It could mean that Piper is not Sahan's first romance after all.