I'm translating it to English right now, although I only translated 40 minutes of it so far. I'll post the link to the subtitles when I'm done translating it. Might take 1 or 2 more weeks? Hopefully less than that. I do want to finish translating it.
No there's no romance. I still like the drama a lot despite there being no romance. ^^
No, there's no romance. IU and the rest of the cast did a interview last night on VLIVE to say that there isn't. In the interview Lee Sun Gyun said “It’s not a love story, but a human story.” And IU said, “We’re not making a romance or fantasy drama, but telling a story about reality and people. It’s not a story that says, ‘Reality should be like this,’ and it’s not a beautification of reality. Rather, it’s a drama that says, ‘There is this kind of reality. How should we live?'” You can see screenshots from the interview here: https://twitter.com/_AuroraRain_/status/976806184626937856
"Falling for his warm charms" basically just means that Lee Ji An is realizes that there are genuine people in that she can trust. Since just looking at the character description on the official website, it mentions that she has been betrayed so many times that she doesn't trust anyone.
https://www.youtube.com/playlist?list=PLIDckZuI0IdXV9cQCbAB1BjOh5hedstBv
https://www.youtube.com/playlist?list=PLIDckZuI0IdWTH_b2J_znsmguHSDNzTXG
https://www.youtube.com/playlist?list=PLIDckZuI0IdXVWCt3ewh5CAsNxM8BhFFw
https://www.youtube.com/playlist?list=PLIDckZuI0IdUOQ7ju0EvL4HwvBWy6QHJr
https://www.youtube.com/playlist?list=PLIDckZuI0IdX7tnUWGkq4m4lJ_5j6hgDN
Link: https://www.youtube.com/playlist?list=PLIDckZuI0IdXXBlwqapK8D4qu6FeXL36L
RAW: https://dorama.site/butterfly-sleep/
https://rerips.com/butterfly-sleep/
https://mkvking.com/butterfly-sleep-2017/
Softsubs: https://subscene.com/subtitles/butterfly-sleep/english/1895432
• https://www.soompi.com/2018/02/07/go-hyun-jung-announces-departure-return/
• https://www.soompi.com/2018/02/07/go-hyun-jung-denies-allegations-physical-assault-explains-left-return/
• https://www.soompi.com/2018/02/07/sbs-issues-statement-regarding-go-hyun-jungs-character-return-rumored-ban-from-future-dramas/
You can see screenshots from the interview here: https://twitter.com/_AuroraRain_/status/976806184626937856
"Falling for his warm charms" basically just means that Lee Ji An is realizes that there are genuine people in that she can trust. Since just looking at the character description on the official website, it mentions that she has been betrayed so many times that she doesn't trust anyone.