Are there anything to care about in this universe?

Due to impermanance of everything, Are there anything to be happy or sad about ? Even about **dhamma** ? If something seems like to be happy, there are some reasons to not to be happy. 1. It is impermanant for sure. but also, 2. That **happiness make sadness in the future (future includes next lives)** (I need to be sure about this sententce, please mention about this in your answer) Are enlightened people happy ? Or neither happy nor sad ?