Associated Names:
I Became a Patron
I Became a Sponsor
Я стал спонсором
糖果爸爸的搶婚大作戰
스폰서가 됐다

========================

Summary:
Women would prefer to become the 2912th wife of a handsome and rich husband rather than the wife of an ordinary man. One day, the rich Seo Joonhyeok makes offers a bet of 1 billion to the noona he had an unrequited love with during his school days. A week's period of trip on an island with only the two of them. Will Seah not return to her fiance and become the main character's woman? The test has begun.

========================

Chinese: https://e-hentai.org/g/3174367/05a7bde525/

========================

I recommend reading the manhwa on PC using Yomikiru, and on Android using TachiyomiSY.