Quibbling till the end (2)

When the villagers saw Yu Cheng, they already had a feeling that something had happened but they did not expect to eat such a big melon. What? Yu Cheng tried to steal from the Yu family. And even though Yu Dong left him alone, he was filled with vengeance and set fire to Yu Dong's fields?

"No! She is lying, she is trying to take revenge on me because of what my father did to her husband! Why don't you all listen to me? Yu Dong, even if parents treated you badly, there is no need to take it out on me. Let me go, I want to go home." 

Even though he was shouting and screaming, no one was willing to trust him. For one reason, Yu Cheng smelled of oil. 

If he did not set fire then why was he smelling of oil?