On the eve of our engagement, I discovered my fiancé's lover's promotion plan

Summary

On the day of our engagement, I accidentally discovered a secret file on my fiancé's phone.

It was titled: The Official Wife Promotion Plan.

[Give my fiancée 3 chances. If she passes every test, I will marry her and stay with her for the rest of my life.]

The first test was to give my engagement ring to his first lover.

I suddenly remembered what he told me a few days ago. He said diamond rings were tacky and that he wanted a "ringless" engagement ceremony.

I thought he was planning a uniqu