Yin-Yang Converting Merchant is a Manga/Manhwa/Manhua in english language, Manhua series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Adapted from the novel [Nether Market Merchant]. Mastering the yin/yang of life and death, manipulating the three realms, cocky and face-slapping, loli protecting, nether mining, royal beauty dating: he’s the first online merchant of hell, whom the devils call daddy upon sight.