A Poor Family's Son-in-Law? Sorry, I'm a First-Rank Marquis Who Guards the North!

Ten years ago, the Lin family was caught in a terrible conspiracy and slaughtered by bandits. Han Yan'er risked her life to save Lin Bei, drawing the bandits away alone, only to fall from a cliff and break both her legs... Ten years later, Lin Bei returns from the army, having been granted the title of First-Rank Marquis of Zhenbei by the emperor! To repay her kindness, he willingly becomes a live-in son-in-law to the Han family. To avenge his family, he sends the army of Mobei to surround the city. He stands before the three armies with Han Yan'er at his side. The soldiers all drop to their knees. “We pay our respects to the Marchioness of Zhenbei!” Han Yan'er stares at Lin Bei in shock. “So... you were never some useless live-in son-in-law at all...”