The implication is very clear, we see the perpetrator pushing into the shower of the victim but then it cuts to the next scene. She describes the assault in detail to a trusted friend soon after.
There is a shower scene in which a young woman is expecting her partner and Seb shows up instead, she tries to pull the curtain back and gasps, the next thing we see is her gathering her weapon and trying to leave the house. Her partner finds blood in the shower and asks if she started her period.
A child in the "past" is abused by his dad, this kid grows up to be sexually and emotionally abusive to the women in his life. He also attacks his father.
The main antagonist Sebastian is being interviewed by a psychologist throughout the series to assess whether he is mentally well enough to understand what "he has done".
Jean-Louis and Françoise Rodier are shot to death in their own home because they have a winning lottery ticket worth 70-million francs. Their killers make off with the ticket while the Rodier children escape.
Francine, Thierry and Laurent's mother, is murdered by her husband and his mistress.
Julien and Amelie get away with their bloody revenge on the Personnaz and Genesta families for murdering their parents.
Manu, Alice, Maud, Mathilde and Leonore survive the ordeal and agree to keep Julien and Amelie's identities a secret. Sebastien is framed for the murders and committed to a hospital for the criminally insane.
Your mileage may vary on whether an ending that leaves an entire village dead is happy or not.