Sorry, My Unspeakable Love tells the story of Ethan Ashford, who lost his mother in a fire as a child and was adopted by David Ashford. He grew up with Ivy Ashford as siblings for eighteen years, but they are not blood-related. In an accident, Ethan is severely injured by thugs. With the hospital running out of AB blood, Ivy begs Nathan Sterling, a powerful business tycoon passing by, to donate blood. Nathan becomes interested in Ivy and asks her to be his girlfriend.
Luna Feng, who has a crush on Ethan, stirs up trouble and makes Ethan mistakenly believe that Ivy has betrayed him. Nathan accidentally discovers that Ethan is his long-lost cousin who can inherit half of the family fortune. However, out of jealousy over Ivy and the inheritance dispute, he hides the truth and stages a car accident to make Ethan disappear.
Three years later, just as Ivy is about to give up and accept Nathan's proposal, Ethan returns strongly. The two finally confess their love for each other, but they face neighborhood criticism, Nathan's crazy obstruction, and the secret plot of Nathan's enemy, falling into a desperate situation of love and hate.
