"Our Fake Marriage: Rosé" centers on a contractual relationship between two individuals, blending themes of romance, personal growth, and societal expectations. The protagonist, a young woman named Rosé, enters into a fake marriage with a wealthy and reserved man, Hiroshi, to fulfill a mutual need. Rosé seeks financial stability and a way to escape her difficult past, while Hiroshi requires a spouse to appease his family and secure his inheritance. Despite their initial arrangement being purely transactional, their relationship evolves as they navigate the complexities of their shared life.

The narrative explores the dynamics of their fake marriage, highlighting the gradual development of genuine feelings between Rosé and Hiroshi. Rosé, initially portrayed as pragmatic and guarded, begins to open up as she experiences kindness and support from Hiroshi. Similarly, Hiroshi, who is initially aloof and focused on maintaining appearances, starts to show vulnerability and care for Rosé. Their interactions are marked by moments of tension, humor, and emotional depth, as they confront external pressures and internal insecurities.

Secondary characters, such as Hiroshi’s family and Rosé’s friends, play significant roles in shaping the story. Hiroshi’s family, particularly his overbearing parents, exert pressure on the couple to conform to societal expectations, while Rosé’s friends provide her with emotional support and perspective. The manga delves into themes of trust, identity, and the societal constructs surrounding marriage, as Rosé and Hiroshi grapple with their evolving feelings and the authenticity of their relationship.

The plot is driven by a series of challenges that test the couple’s commitment to their arrangement and to each other. These include misunderstandings, external interference, and personal revelations that force both characters to confront their pasts and redefine their futures. The story balances lighthearted moments with emotional depth, creating a narrative that is both engaging and thought-provoking. Through its exploration of love, duty, and self-discovery, "Our Fake Marriage: Rosé" offers a nuanced portrayal of a relationship that begins as a facade but grows into something profoundly real.