Song Yan grew up with her neighbor's son Nan Chi. She never returned to this home after her parents died.
Two years later, she accidentally returned to her former residence. The place brought back many memories of her parents, which made her extremely painful and wanted to leave.
Nan Chi stopped her before she left, and in order to get rid of him, she made her first promise.
When Nam Chi succeeds in doing so and appears in front of her to demand fulfillment of her promise, she breaks her promise.
In order to get rid of Nanchi's entanglement, she casually threw away promises one by one, just to get herself out.
In the end, it was discovered that there were too many arrears and there was no way out.
Concept: When you are stuck in painful memories, you may just need someone to hold you back.