The TV series in which Sun is the chef is "Good Sir", in which he plays Michelin's three-star chef Lu Yuan. He is a devil in most people's eyes, smoking, drinking and gambling, but he is a very different kind of good gentleman in the eyes of his lover, who has emotional entanglements with Gan Jing and Jiang Lai.

Gan Jing is Lu Yuan's ex-girlfriend. They used to love each other deeply. In order to let Gan Jing realize her dream, Lu Yuan gave up everything to accompany her abroad. They spent the most difficult time together, but after their life gradually improved, Lu Yuan was unexpectedly imprisoned. In order not to implicate Gan Jing, he concealed the truth and broke up cruelly. After his friend Da Peng died in a car accident, Lu Yuan returned to China with his daughter Peng Jiahe, who was under 18 years old, and wanted to give Peng Jiahe to his mother for support. Unexpectedly, she met Gan Jing and her fiance Jiang Haokun as soon as she got off the plane. By chance, Lu Yuan met Jiang Haokun's sister Jiang Lai and started an emotional entanglement between men and women.