Huang Yi-Zhi loses the engagement ring on the train on the day of his marriage proposal.

Zong-Fang stumbles upon the ring and lies about his status to win Ya-Wen's mother's approval.

The ring ends up in the hands of retiree Tseng Yun-Sheng who bumps into Wang Ching-Fang.

The ring gets taken by a thug, while Yun-Sheng and Ching-Fang try to get it back.

Different couples come in contact with an engagement ring misplaced by a man.

Lisa entreats Yi-Zhi to help save her parents' marriage.