A remake of the 2018 South Korean film of the same name, Keys to the Heart never really seems like it comes together as a thematic whole. In its bid to be a modest slice of life—as a story that just happens to feature boxing and classical music amid family conflict—its separate parts wind up feeling underdeveloped. So despite admirable work from its cast and big emotional moments that are treated with a surprising level of sensitivity, there's always a sense that the film is constantly trying to be a soap opera instead of simply being a messier, more organic thing.