Ling and Tong are twins who are in their upright and rebellious stage. Because their two fathers were at odds with each other, when they were quarreling over old scores, they suddenly uncovered a misunderstanding from more than a thousand years ago. The two set out to the past to resolve and understand this misunderstanding with their fathers, and they had to make changes.
They originally wanted to solve a small matter, but they didn't want to affect a lot and lead to changes in the future. In the process, the two quarreled and tried to find a way to straighten out the past, but they didn't want to make one wrong step and change the future. The war that happened between the two fathers when they were young is inevitably undergoing changes.
Concept: The child has reached the rebellious stage and the parents have reached menopause.