Where is Our Agreement to be Each Other’s Arch-Rivals?

The web celebrity, Chen Suyang, transmigrated into a film adaptation he’d just finished rolling the death scene. Now he has to play the villain—the Evil Sect’s young master, Su Yang. To return to his own world, he faithfully acted according to the script and solemnly recited his lines—waiting for the day he’d die under the protagonist’s sword. But... why were the scenes getting farther and farther from the script?