A House Servant, a Hidden Legend!

A special forces soldier wakes up in an old dynasty as a third rank house servant of the Su family. He would happily coast, hide what he can do and draw his wages. The Su dye works are failing, so he uses what he knows and produces yellow and purple dyes nobody in the trade can match, which saves the family and moves him up to first rank servant. That puts him in the middle of the household's women: Su Muyan the eldest daughter, Wang Zhuqing, the maid Yuer, and Qin Lan, a princess living in the house under a false name. The three great clans move against the Sus more than once and he unpicks each attempt. He goes to the capital, sits the imperial examination and passes it, and the emperor has him found a guard corps. When he decides he has done enough and wants to go back south, Su Muxue announces in front of the whole household that she intends to marry him.