Don’t take the plot too seriously when you watch it, because it can get illogical.

1) the female lead has no idea who her sister had a planned marriage to. Even if you replace your sister in the marriage, your curiosity would have searched his picture online.

2) it took the female lead long enough to realise that the guy she was marrying to was the nice guy that has been helping her. There were literally so many clues.

3) the male lead didn’t manage to find out the existence of the other twin sister when he was doing a search on her family background.

It’s either the plot is illogical or everybody is dumb in this drama. I guess it was meant to be the latter because all the hilarious scenes centred around the silliness of all the characters. So watch it with the mindset that they want to make you laugh with the nonsensical thinking of all the characters. Because, the genre of this comedy is surrealism. Oh and I forgot... the male lead is hot!