Christian can no longer stand having Martin and Simon in his house. Étienne tries to fill the assistant manager job at the gym, helped by Simon's rather strange advice.
Simon, Christian and Étienne attend Martin's old friend Steak's funeral. His death puts things into perspective for the foursome. Christian repeatedly attempts to disguise his thinning hair.
In an attempt to get closer to Martin, Sophie has the brilliant ideal of sharing everything, even time with the boys. Christian is forced to accumulate roommates, while his mother's illness progresses.
Étienne wonders about his boyfriend Dan's potential drinking problem. After a drunken dinner, he reveals to Sophie that Martin cheated on her with Sylvie, Christian's ex.
Christian learns that his son Sébastien has made a mistake that could bring him a little too close to Simon, while Étienne is entrusted with his new recruit Salomé's baby.
Christian plays real estate agent to help Étienne rent his condo before his departure to Australia. Simon has to attend a 25th anniversary celebration. Martin is trying to keep busy since Sophie left for her sister's.
Christian is forced to adapt his literature classes to the particular sensitivities of the new generation, while Martin must adapt to his new relationship with Sophie, since she has made him to live in the garage.
Back to square one: Martin has returned to live with Christian where Simon and Sébastien are still living. What's more, as the university continues to modernize, Christian is at the end of his rope.