Who is Saul Durand in 3 Body Problem?
Saul Durand (played by Jovan Adepo) is the theoretical physicist in Netflix's 3 Body Problem and one of the "Oxford Five." For most of season one he's the least impressive of the group: while everyone else is racing to save the world, Saul is coasting — smoking weed, indifferent to his own research, barely present in his own relationship. It's easy to write him off as background.
Then the final two episodes swing the camera onto him. Ye Wenjie seeks him out before she dies and leaves him a cryptic set of rules; moments later a man on a moped tries to shoot him dead. That's the moment attentive viewers realize the seemingly useless one is the story's next protagonist.
Who is Saul Durand based on in the book?
He maps onto Luo Ji, the central figure of The Dark Forest, the second novel. If you want the full arc of that character — the slacker who becomes humanity's last hope — start with Luo Ji, the reluctant savior of book two. Netflix kept Luo Ji's function but changed him from a Chinese sociologist-astronomer into a Black theoretical physicist in the Oxford orbit, sharper-edged and more detached.
What did Ye Wenjie tell Saul before she died?
She handed him the two axioms of cosmic sociology. It plays like philosophical filler, but it's the most important scene in the season. Those two rules — survival is the primary need of any civilization, and matter in the universe is finite while civilizations keep growing — are the entire starting point for deriving the dark forest. Ye Wenjie never dared follow the logic to its end herself; she planted the seed in Saul. In the novel she does exactly the same thing, and the person who receives it is Luo Ji. Saul's real job, from that moment, is to reason his way alone to the dark forest theory.
Why does someone try to assassinate Saul?
Because of what he might think, not anything he's done. The Trisolarans, through the sophons, can read every human communication and every written word — but they can't see inside a person's mind. Someone capable of independently working out the dark forest logic is the one threat they can't predict or lock down. So they try to eliminate Saul before he gets there. And the failed hit backfires: the very fact that the enemy wants him dead is what proves to humanity he matters. That's the exact logic behind the Wallfacer Project choosing Luo Ji — a man who doesn't know why he's important becomes humanity's only hope after surviving an assassination.
How is Saul different from Luo Ji, and what happens in season two?
Book Luo Ji is a wry, secretly brilliant sociologist; Netflix's Saul is a more openly cynical, more isolated physicist, rewritten to land with modern viewers the way the show reworks all its observer-type figures. The real payoff is season two: Luo Ji's Wallfacer arc — dragged from wanting to do nothing into carrying all of humanity, then forcing Trisolaris to the negotiating table with a single act of dark forest deterrence — is the most dramatically charged stretch of the whole trilogy, and season two is essentially his show. For how that line is likely to unfold, see the full breakdown of the season two Wallfacer setup.