I've Survived Through the Ages by Telling the Truth

Lin An traveled through time and became the most cowardly scholar in the Dayin Dynasty. On the wedding day, his fiancée came to the house with his new love to break off the engagement. When you are humiliated, you must be bound to the [Principle of Sincerity] system and must tell the truth 100%. The fiancée sneered: "Tell the truth, are you a waste?" Lin An (uncontrollably speaking): "I'm not useless. But you have a red mole on your right armpit, and he has a birthmark on his left hip. I saw you two having sex in the inn three days ago." The whole place was dead silent, the fiancee's face turned pale, and the new love drew a knife to silence her. The eunuch of Dongchang suddenly appeared: "Boy, come with us, your mouth is... Interesting." From then on, Lin An lived a life of telling the truth every day, being hunted every day, and wanting to resign every day. The prince asked, "Do you think I might ascend the throne?" He fell to his knees and said, "Your Highness, you have athlete's foot..." The Prime Minister sneered: "What does Lin Yushi think of the new policy?" He winced: "Prime Minister, your grandson owes a debt of three thousand taels in a brothel..." The emperor angrily shouted: "Lin An! Can't you tell a lie?!" He cried sadly: "Your Majesty, I... I can't control my mouth!" Until one day, the enemy's army pressed on the border, and the civil and military forces of the Manchu Dynasty were helpless. The emperor on the dragon throne sighed: "Lin Aiqing, tell the truth, Dayin... Can we still be saved?" Lin An looked at the [Truth Torrent] on the system interface, his legs softened, and he knelt down again. "Your Majesty... I tell you the truth, you... You help me up first, my legs are weak."