Haewon, an emotionally detached violinist, drifts through life without resistance—never blocking those who enter nor clinging to those who depart. When his sole confidant Taeshin takes his own life after repeated unanswered calls, the tragedy pierces through Haewon's carefully constructed emotional walls. The encounter that follows with Woojin, Taeshin's former love interest, sets off an unexpected collision between two worlds that were never meant to intersect. Trapped in a dangerous assault investigation, Haewon discovers that the business card he'd carelessly discarded becomes his lifeline when Woojin—now revealed as a prosecutor—arrives with unexpected protection. What begins as uncomfortable indebtedness transforms into an unwanted entanglement as Woojin persistently closes the distance Haewon desperately tries to maintain. Caught between guilt and the magnetic pull of connection, Haewon must confront whether true detachment is possible when someone refuses to let you disappear.