Stars in the Dark (2017)

Jiang Kai stays in hospital, knowing his days left no much. One day his grandson brought him a glass bottle and it remains him the days with his first love, Yu Lan. They used to catch the fireflies with the glass bottle. However, Yu Lan had to marry Mr. Fang. In order to find out the story behind the glass bottle, grandson visits the village where his grandpa used to live.