1. Many individuals become more outgoing after completing their university education due to the increased emphasis on social skills during this period.2. University campuses offer a variety of activities such as parties and club events that encourage students to interact with others. These events often require students to perform on stage or give speeches, which helps to foster a more extroverted and cheerful personality.3. Students seeking to join clubs must undergo interviews, which迫使 them to improve their communication and self-introduction skills. Some students join multiple clubs, leading them to participate in several interviews, further promoting their character development.4. Many college students take on part-time jobs during the summer or weekends to gain work experience. These jobs provide opportunities to develop communication skills, as they frequently require interaction with strangers. The varying frequencies of such work expose students to different levels of engagement, all of which contribute to a more outgoing nature.5. Upon graduation, people tend to be filled with anticipation for the future, experiencing feelings of happiness, fulfillment, and optimism. This positive and expectant mindset allows them to approach life with a joyful attitude.6. Graduation signifies independence, as students start earning their own living and taking on responsibilities as adults. The pursuit of hopes and goals leads to a cheerful disposition, which is a normal and widespread phenomenon.