The journey going back to the mountain resort where Tristan and Matthew were staying was spent by answering Zhen-Zhen's innocent queries about cars and vehicles.
It was her first time seeing a car and riding it. She was really amazed by these new things. She pestered Tristan during the entire journey, asking him lots of questions about cars.
Tristan, on the other hand, answered and explained everything to her patiently. Surprisingly, he didn't feel annoyed by Zhen-Zhen's unending curiosity about many things that are new and unfamiliar to her.
He enjoyed telling her information. He couldn't contain his laughter whenever Zhen-Zhen would look at him with her innocent and amusing eyes after hearing his answers.
She would flash her charming radiant smile the moment she absorbed all the information Tristan had given her. That's one of the reasons why he loved teaching her. Her smile was enough in exchange for all his efforts.