Silent Cake

Left disfigured after an unfortunate accident, Shen Lang, a doctor, has become so ugly that no one dares to look at him. This makes him decide to become a noble spirit instead and save lives along war-torn borders. He lives a lonely life, remaining single until a bomb takes his life. 
At that fateful moment, he swears that if he can live again and get his handsome face back, he would use his charm to flirt with the most beautiful woman and live an extremely relaxed life.
He transmigrates to another world and in this life, he has the body of an absolutely handsome man. However, the said owner of this body is a live-in son-in-law, one who was chased out for being a useless moron, of a wealthy merchant. 
In order to fulfill his goal of living an extremely relaxed life, Shen Lang finds his way to become the new son-in-law of the 'Goddess' of the much more influential Palace of the Earl. Yet the only way he can truly live a relaxed and enjoyable life is to eradicate all his enemies, and all those who seek to bring the Palace of the Earl down!

History's Strongest Son-In-Law Living With The In-Laws

The Earl flipped open the book and said sincerely, "Although I can memorize this book fluently, I still flip it occasionally in case I have forgotten and lost my sense of direction in life. As a half son of mine and part of the Jin Family, you have the responsibility and right to study the family mottos."

"Roger!" Shen Lang took over the book respectfully.

The Earl said, "As a member of Jin Family, everyone has to memorize the book well. When you memorize it, you can leave the room and go anywhere you like."

"Ah…" Shen Lang was stunned. "Then, how many words does this book have?"

"Not much, only 50,000 words. I spent one month, Mulan is smart and only took 23 days to memorize it," said the Earl, "you have to memorize it word for word before you can leave the room. Do you understand?"

50,000 words and memorize it word for word?

Fun Fighting with Father-in-law