English name: Ten thousand ways to win sexy guys's hearts. (via manganato)

There are 2 chloroform scenes. The first one (first 2 panels) begins with a guy chloroforms the main female but she's able to fight back. The second one happens in the next chapter, this time she is chloroformed by a female villain and goes unconscious.

Source:
Ch.35: https://www.xianman123.com/gonglueyaonandeyiwanzhongzishi/501161.html
Ch.36:
https://www.xianman123.com/gonglueyaonandeyiwanzhongzishi/501162.html
English site: https://readmanganato.com/manga-je986539/chapter-15