琉璃年华de那个他青春年华de那个她
[liú lí nián huá de nèi gè tā qīng chūn nián huá de nèi gè tā]
The phrase refers to reminiscing fondly about past lovers from one's youthful and beautiful days ('liuli' meaning colorful or exquisite), reflecting on memories of young romance and idealistic relationships during adolescence.