While Fe is sweet, sociable and works hard to assist her parents with the household expenses, Gloria is a beautiful, arrogant and cold-hearted millionaire who has everything she could ask for except that she is unhappy and has a deep resentment towards her best friend with whom they affectionately call each other "monster".

One day, Fe falls madly in love with Sergio Grimán, a legal assistant who failed to finish Law school due to several family problems.

Her hatred and envy for her friend grows everyday when she realizes that Fe will have everything that she cannot have: half of her fortune and the love of Sergio, with whom Gloria has also developed an attraction to.

Considering that her late father put a clause in his will that she can only receive her inheritance once she is married, Gloria begins the process of seducing Sergio to steal him away from her friend.

The only person who is aware of her plans is Elias Grimán, a handsome young priest who tries to counsel Gloria to find it in her heart and forgive her friend.