It is not possible to generalize whether people who have served sentences are "difficult to reform". There are many factors involved. 1. Social and institutional factors: • The experience of serving a sentence often leads to certain social labels or stigma, which makes many people encounter difficulties in employment, residence, social relations, etc. after being released from prison. Social prejudice and discrimination against them may affect their opportunities to reintegrate into society. • In some countries and regions, legal restrictions on people with criminal records may also hinder their access to some normal social services or career opportunities to a certain extent. 2. Individual factors: • Everyone has different experiences, motivations and personal abilities. Some people may reflect deeply on their sentences and are determined to change their lifestyles, while others may find it difficult to adjust themselves due to the environment, habits or various pressures. • Mental health, family background, education level and other factors also have an important impact on their reconstruction of life. 3. Reconstruction and support mechanism: • More and more countries have begun to pay attention to both "correction" and "reconstruction", that is, to help prisoners return to society through education and training, psychological counseling, employment assistance and other measures. Some successful cases of reform show that giving full support and care can indeed help them achieve self-transformation. • The intervention of communities and social organizations can often alleviate social exclusion and provide them with necessary resources and networks, which is very helpful for rebuilding a new life. In summary, although the experience of serving a sentence will bring certain negative effects and many obstacles, it does not mean that one is doomed to be unable to reform. Social support, policy improvement and the personal efforts of prisoners are all important factors in promoting their reintegration into society and achieving success. The key lies in how to establish a more sound help system, reduce stigmatization, and give those who truly repent the opportunity to reform.