Yuanyuan did a good deed and felt happy.

Blissfully describes being happy in the heart and showing a proud look on the face. It would be great if he got perfect marks. Synonyms include "lezizi" and "joyzizi". Often used to describe happiness.

In addition, you can also create the following example sentences with "Blissful": 1. Whenever the teacher praises me, I always feel happy in my heart. 2. Her mother’s praise made her feel happy.