Fake Slackers

When the classroom rosters were announced, the school's two most notorious boys Xie Yu and He Chao were not just placed in the same class, but became desk-mates as well. Even though they're obviously smart, they pretend to be delinquents, always acting out, fighting to be last in class rank. They may look like they're playing games and slacking off every day, but they actually study hard in private. So what's the deal with these two guys who are always at the bottom of the class on every test?