Synopsis: Unbalance Triangle

Living with his sister Hakyung Choi, Taehyun Choi's life seems ordinary. While Hakyung boasts of a prosperous professional life, Taehyun struggles with academics. However, his life takes an unexpected turn when he accidentally discovers that Hakyung is not his biological sibling. Despite deciding to confront her, Hakyung suffers a terrible mishap and loses her memory, causing a shift in Taehyun's perspective. The previously overlooked bond of kinship suddenly holds more significance than ever before.