The Big Boss Comes Down the Mountain: Starting as a Male Secretary is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Meng Hao, one of the top business tycoons in Tianshui City, was on the brink of death when a poor young man suddenly appeared and saved him with unparalleled medical skills. To the utter astonishment of Meng Xin'er, the beautiful and wealthy granddaughter of the Meng family, the first thing her grandfather did upon waking up was to insist that she marry this poor young man and make him her "personal" secretary!