Gan Yu's signature can be written according to her personality and characteristics. Here are some possible options:

1. Sweet as rain and warm as spring breeze.

Rain is as sweet as honey, not as sweet as my smile.

3. Rain moistens the heart and smiles light the soul.

4. The gentle rain drops from the showers, and the soul rushes with the fountain of love.

5. Ganlin is chicken soup for the soul, feel the moisture she brings.

6. Rain soothes your soul and makes you find yourself again.

7. Sweet rain is a landscape, and her beauty blooms in her heart.

8. Rain makes you feel the power of love and makes you fall in love with life again.

9. Rain is the refuge of the soul. It protects you from the outside world.

10. Sweet rain is a treasure, so you can constantly discover new surprises.