Well-being is a central issue in guidance and counseling services in Indonesia, done to support individuals in obtaining their well-being to be happy, and satisfied about life. This study aims at analyzing psychological well-being of pre-service teachers as a basis for developing their guidance and counseling services. A classical twin design was used to decompose behavioral variance characteristics of psychological wellbeing of 132 teachers as subjects randomly selected. Psychological well-being was measured using the 14-item Ryff Psychological Wellbeing Scale, which had been adapted to Indonesian to measure the aspects of autonomy, environmental mastery, personal growth, positive relationship with others, purpose in life, and self-acceptance. The results show that guidance and counseling services had to develop psychological wellbeing of the pre-service teachers, to help them remember life events in a more positive manner, which resulting in happier life. Conversely, preservice teachers with a low level of psychological well-being did not really care about their positive or negative experiences and more likely to ignore their life in the future. It revealed that psychological well-being was important in the development of guidance and counseling services to prepare pre-service teachers well-being in the future.