Sofía, a dentist, and Tristán, owner of a shoe store, live in the same building but have never met or even seen each other. Disenchanted with love, both have sworn never to fall in love again, until they finally meet. Ángel, a friend of Sofia's, settles at Tristán's house and invites her to the cocktail bar where he works. There Sofia meet Tristán. The two share a "Bloody Mary", which acts as a explosive filter of love.