No Gain No Love follows Son Hae-yeong, a woman eager to secure a career promotion, who strikes a deal with Kim Ji-uk, a convenience store employee from her neighborhood. To avoid jeopardizing her promotion, she convinces him to participate in a fake marriage. As the two navigate their unexpected arrangement, they start to develop feelings for each other, complicating their personal and professional lives. This light-hearted Korean drama explores themes of love, career, and the consequences of fake relationships.