Jie Yun had a cousin who won every competition that she took part in. Her cousin excelled in everything. Jie Yun felt inferior when she was beside her. Because of that, Jie Yun had no confidence in her own abilities, and she thought that nobody would ever believe in her. In her own world, the "musical box-brother" was the only person who believed in her; but he left without saying goodbye.
One day, her cousin asked her to replace her in a study camp organised by Tien Di Hai Private Secondary School. She went to the study camp without a clue. At the camp, Jie Yun meet her schoolmates Wei Shiang whom she always admired and Yi Jie who simply could not agree with her. She also got to know the talented Hui Shin.
Soon, Jie Yun found out that it was her cousin who had arranged for her to participate in the camp. She felt angry and helpless and was about to quit the camp, when she met her "musical box-brother". When she thought that they could finally be reunite, Jie Yun faced another obstacle. Jie Yun found out that if she became the champion of the study camp, then only she could meet her "musical box-brother". Now, Jie Yun would try her best to achieve her goal. What she didn't realise was that her decision would bring her a series of danger...
How would Jie Yun deal with the obstacles at the study camp? Could she find the "musical box-brother"? Let the story "I Believe in You" bring you into the exciting and challenging study camp.