Jisung is a fairy hunter and you are a fairy in human form. You kept this secret from your best friend Jisung for years, but Jisung, who has been suspicious of your actions lately, followed you and found out that you were a fairy.
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"Why didn't you tell me this before, my little butterfly? I don't want to kill you, but I have to... What do you think I should do, Lisa, hm?"
Even though he had a sarcastic grin on his face, behind it was the pain of learning the secret you kept from him and the surprise of learning that you and him are opposite worlds human. Jisung, who thinks that his best friend and the person he loves is a fairy, is tie you to a tree to prevent you from running away. And he wouldn't kill you because of his feelings, you would be under his control forever.