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.
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.
I pretty much binge-read ‘Mom Addiction’ last month, while I was sick and hadn’t any other books to read. It has a clear ending, resolving the main conflict. I read a complete translated copy of the novel, without any ‘to be continued’ notes. So you’re safe to start reading ‘Mom Addiction’ without having to wait for further updates. The ending was a bit abrupt, but all chapters are included. I wouldn’t expect any more chapters to be added.
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.