Cindy takes it upon herself to become the change she seeks. Romance flourishes at her clandestine 16th birthday bash.

Lucía reveals her feelings to Cindy — at least partially. Their double date does not go as planned and a fleeing Cindy stumbles on someone unexpected.

Sending notes in class leads to a misunderstanding between Tere and Angie. After the school’s talent show, Cindy and Lucía come clean to each other.

The physics club moves at full steam, as do Cindy's — and Lucía's — new romances. But things do not remain rose-colored for long.

A lie — and a secret — lands the gang in Mexico City. After the principal fails to keep her word, Cindy is driven to make a surprising move.