Reason for Taro's Sadness:
Taro was sad because he wanted to make life better for his parents. Let's explore this further.

Taro's Desire to Improve His Parents' Life:
- Taro's main concern and motivation in life is to ensure a better life for his parents.
- He deeply cares for them and wants to provide them with a comfortable and happy life.
- Taro may have witnessed his parents' struggles or sacrifices, which could have influenced his desire to improve their living conditions.

Understanding Taro's Sadness:
- Taro's sadness stems from his inability to fulfill his desire to improve his parents' life.
- This indicates that Taro might not have the means or resources to make their lives better.
- He might feel a sense of responsibility towards his parents and the weight of not being able to meet their expectations.

Possible Scenarios:
1. Financial Constraints:
- Taro's family might be facing financial difficulties, preventing him from providing a better life for his parents.
- Lack of money could restrict their access to basic necessities, education, healthcare, or a comfortable living environment.
- Taro's desire to earn more might be driven by a need to alleviate financial burdens and provide a higher standard of living.

2. Limited Opportunities:
- Taro might be living in an area with limited opportunities for growth or prosperity.
- This lack of opportunities could hinder his ability to find a well-paying job or improve his financial situation.
- Taro's sadness may arise from his frustration with the limited options available to him.

Taro's Determination:
- Taro's sadness might also be accompanied by a strong determination to overcome these obstacles.
- His desire to make life better for his parents indicates his willingness to work hard and strive for a better future.
- Taro's determination reflects his love and devotion towards his parents, motivating him to find ways to improve their circumstances.

In conclusion, Taro's sadness is rooted in his desire to make life better for his parents. This desire could be fueled by financial constraints or limited opportunities, causing him to feel a sense of responsibility and a need to provide a more comfortable and fulfilling life for his loved ones. Taro's determination to overcome these challenges showcases his love and devotion towards his parents.