The film is a lively romantic comedy and family drama revolving around the playful and humorous relationship between in-laws ("Biain Saab"). The story connects two families through marriage, bringing together two central couples (played by Ferdous–Shabnur and Shakil Khan–Moushumi). As romantic entanglements and playful rivalries develop between the dynamic in-laws, humorous misunderstandings and domestic ego clashes ensue. Through engaging comedy, melodious songs, and emotional family moments, the narrative celebrates love, mutual respect, and the joy of family ties overcoming all misunderstandings