Lin Zhi, a design intern, has her original designs stolen by her roommate and is maliciously slandered and framed. At the annual company gala, she is pushed into the river. A koi spirit named A Li saves her and sets her a 72-hour survival trial: she must make someone genuinely fall for her to stay alive. Lin Zhi has the ability to hear people's heartbeats, but she refuses to deceive anyone's feelings just to survive. Instead, she calmly gathers evidence and confronts the rumors and accusations. With the help of her companions, she fights against the conspiracy and protects her loved ones. Gradually, she realizes that a fluttering heart does not equal the truth; only evidence can reveal what really happened. Staying true to herself, Lin Zhi overcomes adversity through her own strength and protects what she loves and her dignity.