In the summer when he was seventeen years old, Cheng Ye, a rebellious basketball boy, crashed into the drawing paper of art student Su Mu. The moment cobalt blue paint was splashed, the two were destined to be entangled for half their lives. He is the heir to the Cheng Group and a nearly two-meter-tall dominator on the court, but he clumsily learns to draw straight lines in the studio; he is a quiet boy from an ordinary family, with a paintbrush as his only weapon, but he paints all his secret thoughts like Cheng Ye.
When Cheng's father's thunderous fury shattered the summer dream, Cheng Ye was forcibly sent to Switzerland, leaving Su Mu waiting there for seven years with an unfinished sketchbook in her arms. In the past seven years, Su Mu's world fell apart: her mother was seriously ill, her dreams were put on hold, she changed from an art student to the boss of a design company, and she also split into an indulgent and dissolute sub-personality, paralyzing herself in bars and nights. Cheng Ye's cousin Lin Xiaoyu witnessed his fall, but could only be a silent guardian.
Seven years later, Cheng Ye returned to China with a high profile as the president of the Cheng family, accompanied by his well-matched fiancée. He approached through business cooperation, but encountered two completely different sides of Su Mu - one side was an alienated and indifferent business upstart, and the other side was a flirtatious stranger in a sensual place.
Desire for control collides with hatred, guilt and resistance are torn apart. Cheng Ye took a peek at Su Mu's seven-year scars, and then he understood that leaving without saying goodbye was like a knife stuck in the other's heart. He wanted redemption, but was stung by the dissipation of his sub-personality; Su Mu wanted to escape, but in the regret in Cheng Ye's eyes, he glimpsed the unextinguished light of his youth.
When the truth is revealed, family resistance reappears, and the scheming fiancée interferes, can the two people separated by time reassemble the shape of their heartbeats on the ruins of mutual harm? Cheng Ye's mother's paintings, Su Mu's dusty sketchbook, Lin Xiaoyu's secrets that have been hidden for seven years... Will eventually guide them to find that summer in the studio, tracing each other's heartbeats with brushes.
This is not a simple same-sex love, but a redemption epic about "love has nothing to do with gender, only recognition of the soul" - even if it is bruised and bruised, I want to finish the painting, the last stroke that belongs to us.
Purpose: Love has no definition, trauma can be healed, courage leads to reconciliation.