bittersweet symphony

Translations
горько-сладкая симфония
Life can be a bittersweet symphony, full of ups and downs.
Жизнь может быть горько-сладкой симфонией, полной взлетов и падений.
Definitions
A situation, experience, or feeling that is both happy and sad at the same time; often used to describe something that brings mixed emotions. The phrase is also the title of a famous song by The Verve.