
SPOILER
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It seems like the original Dani in that world, was in love with Yeo Dan oppa and he did reciprocate her a little. But they started dating cause Yeo Dan oppa was being stalked, she wanted to say that it was a fake relationship to the four heavenly kings, but they didn't want to talk to her neither to listen her, so she opened up with Yeo Dan oppa and decided that they were good together and to make their relationship real. But later (months later) Dani will realize that she doesn't love Yeo Dan oppa (she's not even jealous of him, but he's of her so much, he's so cute cause he can't understand that what it feels is jealousy) and will break up
But who was the man at the dooorr behind her ofc