They met because of the rain, and they reunited because of the rain.
A heavy rain caused Shen Yulin to reunite with Yuan Xun, and because of the rain, Yuan Xun and Shen Yulin met again. Still because of the rain, Shen Yulin began to like Yuan Xun. They confessed their love in the rain and embraced each other in the rain.
Intent: Mutual respect and mutual upward love