Responses
Sounds like this manga:
http://www.mangago.me/read-manga/lala_no_kekkon/
You can literally find any manga
Are you god?
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Thank you ٩(๑❛ᴗ❛๑)۶
In this story, there are twin brother and sister. The sister elopes with her boyfriend just before her marriage with some rich guy. So, the brother pretends to be his sister and gets married to that rich guy