So Young 2: Never Gone (2016) on Netflix

A wealthy young man pursues a young woman of modest means, but circumstances often separate them as the years pass.

The story started in high school. Su Yunjin (Liu Yifei) is a struggling transfer student from a regional town, while rich heir Cheng Zheng (Kris Wu) is the star student who sits behind her. He fell in love with her and started to pursue her all the way through college, even though they studied and lived in different cities. Cheng Zheng was ultimately successful in pursuing Su Yunjin, who willed herself to follow her heart for once, even though she knew there would be many obstacles in their way. Soon, they were basking in happiness, and subsequently moved in together after university. However, reality caught up with them two years after graduation. Their vastly different personalities and disparate family background meant their relationship was unequal from the very beginning - their unspoken expectations of each other and all the misunderstandings that came with a mundane lifestyle caused them to part ways with each other. A few years later, both of them establish successful careers, and end up living in the same neighborhood, thus meeting and getting entangled in each other's lives again. They both try to move on with different relationships, but are unsuccessful. When Su Yunjin loses her mother to cancer, Cheng Zheng is the only one to comfort her, causing the former to rekindle their relationship.