Unbalance x 3

Taehyun Choi shares a life with his sister Hakyung Choi, who is professionally successful while he struggles academically. Their seemingly ordinary relationship is disrupted when Taehyun discovers they are not actually siblings. As he prepares to confront her about this revelation, Hakyung experiences a severe accident that causes her to lose her memory. This event marks a turning point, shifting the nature of their bond and making their sense of familial connection more significant.