According to Baidu Game-Fun Query, the method of unlocking unexpected happiness of personalized signature is as follows:

1. After entering the game, click "Expand" in the lower right corner of the page. Then click "Cloud Tour". On the Yunyou page, click "Supreme Painting School".

2. After entering the Supreme School of Painting, click "The Road to Realizing Painting". Then on the drawing page, click "Condensing Ink" in the lower right corner.

An inkstone appeared and painted red with a brush. After tracing, a dialog box will appear.

4. Finally, click "Confirm" in the lower right corner of the dialog box to get the personalized signature of unexpected joy.