The college students named Chen and Zhang didn't attend the morning physical education class regularly. So, they decided to break into the college's system and change their scores in December 2013.
After students heard about their successful effort, other students turned to them for help.
According to Shanghai Daily report, they charged 15 yuan to 20 yuan for each change they made in school's database.
They earned more than 80,000 yuan(more than $12,000) by helping over 200 students.
The school noticed the false records in March and fixed the vulnerability that allowed them to change the scores.