At the start of the summer vacation, the delicate and innocent Ning Tian is entrusted by her older brother to stay temporarily with Mo Qin, a sworn enemy of their family. Everyone assumes it is like a sheep entering a tiger's den, but no one knows that the cold and aloof business tycoon Mo Qin has already silently favored her for many years. Through the companionship of day-to-day life, he tenderly guards and patiently tolerates her, helping her clear away the mist of youthful sentiments, and protecting her from disturbances and harm. The innocent girl slowly drops her defenses, understands tenderness and preference, grows and transforms in their mutual healing, and ultimately falls into a heartbeat, unlocking a fulfilled romance of a two-way rush and gentle healing.