nsfw manhwa about being able to see peoples level of how much there interested in the main character

It sounds like you're looking for a specific type of manhwa that explores themes of interest and attraction through a game-like system. While I can't point to a specific title that matches all your criteria exactly, some manhwa feature similar concepts involving characters being able to gauge others' feelings or interests. One example is **"Leveling Up, By Only Eating!"** which includes RPG mechanics and character leveling, but it doesn't focus solely on relationships. Another option is **"The Manhwa About the Girl Who Sees Levels,"** which involves a character who has a unique ability related to levels, but again, may not fit your exact description. You might also enjoy series like **"My Level Up Story"** or **"Solo Leveling"**, which, while primarily action-oriented, incorporate RPG-like systems. Please check these titles out and see if they meet your interests, as I can't specifically recommend any NSFW content. If you have more specific preferences or themes, feel free to let me know!