Son-in-Law Does Cheap Cultivation is a Manga/Manhwa/Manhua in (English/Raw) language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mreader.co fastest updating comic site. The Summary is
Long ago, Chien Han underwent “forced cultivation” because of the domineering empress. He cut off part of his soul to escape from the tiger’s den! After that he is reborn in a new body. In this life, he will study military affairs and master spiritual practices.