A Century Undercover, Now the Demon King's Son-in-Law

Someone asked, "Zhang Haocun, what exactly did you do to win the Saintess's heart?" Zhang Haocun replied casually, "Max-level blind massage, max-level nest-building, max-level farming, and max-level canal-digging." I manage the medicinal herb fields at our sect. See how much faster you level up after eating the spirit herbs I've grown? [Prompt: Raise the target's favorability to 60 to randomly obtain one of their martial arts.] Zhang Haocun: "I admit you were stronger a second ago, but now I'm just as strong!" As a top-notch undercover agent, Zhang Haocun is a consummate professional who has never failed. He has endured humiliation, bided his time, and proceeded with caution... With the help of the System (manual clowning), he finally rose to the top and won the favor of the Demon Venerable's daughter. This book is also known as The Undercover Agent's Fast Track to the Top, Don't Go Back, Good Son-in-Law, the Righteous Faction Has All Been Turned, Undercover Diary: Starting with a Record of Winning Over the Demoness, and Everyone's Cramming for the Exam, While I Lie Back and Rise to the Top