The Most Beautiful Time to Meet You was a movie released in 2016, starred by Li Kaixin and Zhang Zhilin, telling the story of a pair of young lovers who met, fell in love, and accompanied each other on a journey. The film had achieved good box office results in both mainland China and Hong Kong, and was well received by the audience. However, everyone's perception of the movie was subjective, so the audience's opinion of the movie might vary from person to person.
"Nice to meet you" is an expression usually used to express one's apology or gratitude to another. It literally means "to apologize or be grateful here" but it is often used to express a polite or modest attitude to avoid expressing the other party's feelings or intentions directly.
In the novel, this sentence could be used to express the character's modesty or politeness, or to express the character's apology or gratitude to the other party. It could be used to lead to the next plot or dialogue or to play a turning point in the plot.
It's possible to meet them if they do signings or fan meet-ups. However, it might be rare and only in specific locations. You'd also need to keep an eye on their schedules and announcements.