Based on the provided story, the evaluation can be broken down as follows:

**Tragedy Degree:**
- The tragic elements in the story involve the discovery of a love story that ended due to unfortunate circumstances. However, there are no highly intense or profoundly sad moments depicted in Ruby's journey. The emotions are more about curiosity and a gentle melancholy when she reads the letters.
- Based on this, the Tragedy Degree seems to be moderate.

**Comedy Degree:**
- The story lacks substantial comedic elements. Although it ends on a positive and serene note, it doesn't have humor or moments designed to invoke laughter or joy.
- There is no strong comedic aspect or extremely happy ending that would elevate the Comedy Degree.

Given this analysis, here is the JSON output:

```json
{
  "TragedyDegree": 5,
  "ComedyDegree": 2
}
```

This scoring reflects moderate tragedy due to the melancholic discovery but minimal comedy as the story remains mainly in a reflective and curious tone.
