Jinwoo positioned his shadows everywhere. So he could immediately teleport in case of emergency. He wasn't expecting any errors with his preparations.
Also, it's not too sudden. If you noticed from previous chapters, they showed Cha Hae In a little giving hints the future chapters will somewhat include her. There's been little hints, like very subtle, hints that Jinwoo is somewhat interested in her. But the genre contains no romance so it's fine. This is chap is like an extra. Showing his life outside action. It's just one date. I can't even call it "proper" romance. It's just one chap?
Why dislike the man who did a lot of good things for one date. People really do complain on everything, huh. Like I don't understand. Like chill. It's just one chap. Ya all making one chap a big deal. Making it seem like he did something soooo wrong. lol. Just. Haaaaay. That's all. Thank you.
I think some people feel that romance isn't vital to the plot/just don't like it so ig they'd be annoyed :0 I don't mind but I do wish the FL was more badass HAHA (idk wtf I'm saying)
Spoilers:
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They get married and have a baby which has a extra story and it's really q cute(ノ◕ヮ◕)ノ*.✧











Myghad. Crazy bastard. I hope you suffer more than times you made her suffer. I hope you don't die immediately. Suffer and regret. No redemption for you