Relaciones Peligrosas, originally known as Fisico o Quimica, is a Spanish-language telenovela produced by United States-based television network Telemundo Studios, Miami. It is an adaptation of the Spanish television series Física o Química. It has Sandra Echeverría, Gabriel Coronel, Maritza Bustamante, Gonzalo García Vivanco, Jonathan Freudman, Mercedes Molto, Carlos Ferro, Daniela Navarro, Renato Rossini, Kevin Aponte and Ana Layevska in the leading roles of the plot.

Norman is in love with his girlfriend Jessica but she takes a job opportunity out of town and decides to break up with him. Then he meets Lola, a beautiful girl with many things in common. They start to date but Jessica gets back and want everything to be as before. Now Norman has to decide between the love of his life and his soul mate.

Roger Ramirez is an experienced stock car racer in Mexico. The team that leads the current season offers him to join their ranks and with it, the opportunity to race abroad. His decision means abandoning the team and the people who have supported him to get where he is.