THJCC CTF is a cybersecurity competition tailored specifically for high school and vocational school students in Taiwan. It is co-hosted by the SCINT (Northern Taiwan Student Information Community) and like-minded students nationwide, and has received the support of multiple domestic cybersecurity organizations and institutions. Continuing the tradition of previous events, we are specially hosting the THJCC CTF 3rd Summer Edition this summer, hoping to bring students a cybersecurity feast full of challenges and fun during their vacation. This competition maintains the Jeopardy format, with challenges covering Web, Reverse, Crypto, Pwn, and Misc. The difficulty level balances introductory learning for novices and advanced challenges, ensuring that everyone—from beginners just starting in cybersecurity to experienced competitors—can find an opportunity to showcase their skills here. Our core mission is to promote cybersecurity education and cultivate high school students' keen interest and practical abilities in cybersecurity technology. Beyond the competition, participants in the student division have the opportunity to win prize money or other special rewards, with the hope of boosting their confidence in tackling various future competitions. THJCC CTF is not merely a stage for competition, but also a platform for students across Taiwan to learn from each other, hone their skills, and exchange ideas.