When Rudolph's friends call him he invites Mimi, who is a flower girl, to accompany him.
The second act takes place before the well known Café Momus in the Quartier Latin, where Rudolph and Mimi join Schaunard and Marcel.
Rudolph has bought her a pink bonnet and introduces her to his friends, the fourth of whom is Colline the Philosopher.
The party eat and drink amid the noise and bustle of the fair, when Marcel suddenly sees his old love Musette, gorgeously arrayed and leaning upon the arm of an old man. Marcel turns pale, while his friends make fun of the fantastic couple, much to Musette's anger. She at once begins to make overtures to Marcel, who feigns utter indifference.—Musette's old admirer orders supper, in the hope of pacifying her, while she addresses Marcel in fond whispers. The others watch the scene with amusement, but Rudolph devotes all his attentions to Mimi. Musette suddenly complains, that her shoes hurt her and sends her aged lover off for another pair. Then she proceeds to make friends with Marcel. When the waiter brings the bill, Musette tells him, that the old gentleman will settle for everything after his return.
The party profits by the approach of the patrol, who causes a turmoil, in the midst of which they all escape. Alcindor the old admirer finds only two bills awaiting him, when he returns with the new shoes. Musette has been carried away shoeless by her old friend.
The third scene takes place on the outskirts of Paris called "Barrière de l'Enfer", (The Toll Gate of Hell). To the left there is a tavern, over which hangs Marcel's picture "The Crossing of the Red Sea", as a sign board. The day is breaking, the customhouse officials are still sleeping around the fire, but the scavengers coming from Chantilly soon awake them.
The gate is opened to admit milk-women, carters, peasants with baskets and finally Mimi.
She looks wretched and is at once seized with a terrible fit of coughing. As soon as she can speak, she asks the name of the tavern, where she knows Marcel is working. When he emerges from the inn she implores his help, saying Rudolph is killing her by his insane jealousy. Marcel promises to intervene, and when Rudolph comes out of the tavern Mimi hides behind the trees.