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Regarding the issue of the protagonist’s marriage, it’s the card heroine.
First of all, the author himself is preparing his junior sister to be the heroine. In the author's opinion, they are childhood sweethearts, about the same age, and the heroine's appearance is also first-rate.
However, some people say that they can’t do anything when they grow up, and when we think about it, that’s right!
But if I want to find someone else to marry my junior sister, our ancestor will probably get stabbed in the back.
So I have been downplaying the role of junior sister for a long time, and I really don’t know what to do.
What should the heroine do?
If there is no good way, downplay the protagonist’s life and the role of junior sister.
Every reader has his own ideas, and the author also has his own ideas, and sometimes it’s really difficult, alas.