Sister, Please Exchange This Life with Me

[Single heroine + sister + daily life + campus romantic comedy + body swap] They live under the same roof, but keep the farthest distance, like two parallel lines that never intersect. Until one morning when they woke up, they were horrified to find that they had swapped bodies! From then on, life fell into an uncontrollable chaos. Irregular and unpredictable body swaps occur suddenly, maybe in the middle of an important exam, or on the intense sports field. They are forced to break into each other's world, fumbling awkwardly in each other's social circles, trying to maintain this dark secret. They glimpsed each other's fragility and efforts that they had never shown, and were forced to re-examine each other and themselves. What will happen when the alienation between brother and sister gradually dissolves in the shared secret?