Sun Lu, a conventional kindergarten teacher, harbors a rebellious inner yearning to break free from restraints. An unexpected home visit leads her to stumble into the life of Chen Xudong, an aquarium store owner. In her eyes, he is a "problem" man with a child; beneath her well-behaved disguise, however, he sees the same stubbornness and loneliness as his own. When prejudices dissolve and two hearts quietly draw close in the tranquil world of aquariums, Sun Lu discovers that this gentle man harbors a deeply guarded past. Vast disparities in family backgrounds and sealed secrets stand like a chasm between them. Can their love break through the barriers of reality and become each other's redemption?