This pair of uncle and nephew have just recently met but the first time they met, Fei Yin saved Cheng Sheng who saved Fei Yinzi who got hurt not by the enemy, but under Cheng Sheng's hands after he was hit by Cheng Sheng's fan. Fei Yin deemed him as weak, thus he disliked him, more so when he learned he was his nephew and also Cheng Sheng's disciple, yet still weak like this.
The next time was Fei Yinzi waiting for his match. Now, they can peacefully have a talk. Fei Yin saw that the child was also troubled and needed help but he was obviously too shy to ask anyone, and Fei Yin is Cheng Sheng's lover. Not to mention this is a separate space, thus Fei Yin pulled him in. He also needs to talk with his nephew. He is still his nephew, after all, and definitely will change to be his 'adopted son' with Cheng Sheng.
"How can Fei-shibo say that I don't believe in shiz… shifu?" Fei Yinzi asked.
"Did you never question him before?" Fei Yin asked back.