While the premise of More Than Blue is not focused on time travel, I couldn't help but notice the similarities in tone and structure while watching Someday or One Day. Both dramas go back and forth between the past and present, although in More Than Blue this is conveyed through flashbacks rather than time travel. There is also a significant song that plays a crucial role in both stories. In terms of romance, both dramas feature a main couple dealing with heartbreak and the challenges of moving on.