This is called contrasting cuteness! She obviously likes him but doesn't want to admit it. Ying Yuan represents reason and norms. He is a god who manages all kinds of immortals and handles everything in the upper world. Because of his identity, everyone respects him and behaves in a good manner. Yan Dan represents freedom and nature. She is enthusiastic, innocent, casual and real. Her seemingly random chatter makes Ying Yuan feel relaxed and natural when she is freed from restraints. This contrast is even more dramatic.