Face Slap is a Manga/Manhwa/Manhua in (English/Raw) language, Manhwa series, english chapters have been translated and you can read them here. You are reading Face Slap chapters on ManhwaZ, fastest updating comic site. The Summary is
Cheon Tae-pyeong, the president of Tae-pyeong Private Detective Agency, has a strange ability that lets him see the inner side of a person when he touches their face. Cheon Tae-pyeong, who was immersed in the fun of seeing people’s inner side and making money by solving various requests using his abilities along with each of his special employees (Won Sang-taek, a former gangster, Yoo Jeong-ik, a special agent, and Koo Kang-sik, a scammer), was living a happy life until his unhappy past caught unto him.