Why are there two of the same chapter?

Why does she need to win his heart if they're supposed to be siblings?? Like, he doesn't know they're not actually siblings, so he should already love her.

DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE DOBIN X NOHAE

This is what I wanted.