Is the male lead a cold, genius-like character or more of a blunt/socially awkward character? I’m interested in reading based on this description, but that type of character can be really hit or miss for me depending on how the author develops him. From what I can gather from your description, he sounds like the former.
This is a buddy comedy. A gruff smoker is paired with a hyper cheerful health nut of a roommate who forces him into a quit or die contract. The ridiculous dynamic between these two odd birds is the volume of the film. Meanwhile the comic attempts to sneak smokes and fail, while his obnoxious roommate continues to come up with stranger and stranger ways to prevent him from smoking (e.g. motion sensors on balcony, dye packs in cigarette containers). But beneath the jokes is a real and satisfying story of friendship and the accountability that comes with it. This is the lightest take on quitting I have ever seen. Instead of isolating the smoker in his suffering, he’s forced to go through it with his increasingly weird roommate.
My guess for the most common manhwa queries is The Manager's Special by Yoo In-soo, available on Webtoon and therefore recognized by mainstreamers. The creator is listed in the app, and his style is immediately recognizable to those familiar with the work. For lesser known series, credits may not be as easily found, but for The Manager’s Special information is readily available from a variety of reliable sources. Case closed.
As far as I know there is no English release for ‘Flowers Are Bait’ yet, so you would have to read the fan translations. This wait for manhwa fans is what inspired me to start reading ‘The Dragon Duke’s Flower’ on Tapas (it’s a completed fantasy romance). The heroine is a botanist of rare magical plants, sent to a distant land to save her family. She is to marry the reclusive Dragon Duke in order to save her family from financial ruin, but in this land of dark magic, she must use her knowledge to keep herself alive. It’s a pretty unique take on the genre.