Zhou Shen’ai is a single professional in the later years of young adulthood, drifting between city and countryside, and between restraint and freedom. She floats through life with her thoughts, both settled and uneasy, fulfilled yet listless. Chu Qingran is a mid-level corporate manager, a small-town striver who rode a wave of opportunity and worked his way up to become a modestly successful man. Yet life has brought him not only confidence and ambition, but also unease and anxiety. They were each other’s first love, but chose different paths. Now that they have met again, old wounds and old feelings come flooding back. Only then do they understand that time cannot carry away the regrets of the past. Life forces them forward, and along the way, the fire in their hearts burns out, leaving them with material success and emptiness. Standing on the plane of their lives, they see only a vast, indistinct expanse before them, yet they see each other waiting at the exit from the fog. Each knows the answer to the other’s life, and each answer is unexpected.