FFF-Class Trashero - Chapter 2: With My Instructor’s Qualification On the Line

For unknown reasons, he finds himself transported to a parallel world's Japan, unexpectedly taking over the body of a soon-to-be high school student who had died accidentally. Surprisingly, he did not inherit any memories. However, the first challenge he faces upon arriving here is a language barrier...Just as he struggles to communicate with his new family, a heavenly voice arrives: the black technology system has been activated, and the initial item—translation konjac—has been distributed.This is the story of someone with above-average intelligence but almost no physical strength in the Classroom of the Supreme Power.

His Royal Highness the King of Han, who was afraid of the dark and ghosts and loved to cry, has always been the good baby of the princess.
Until one day, His Royal Highness the King of Han found a book in the bookstore…
Picture book?
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Search keyword: Protagonist: King of Han, Princess of Han

- Description from novelbuddy

She is the Crown Prince’s fiancee, but on the night of their wedding, an edict was made and she was given off to marry the crippled and paralyzed God of War.

On their wedding night, the paralyzed groom pressed her under his body: “Do you want this prince to kill you or poison you?” Lin Chujiu is a famous surgeon so she wouldn’t feel threatened that easily. She turned and pressed the crippled man under her body: “Say, do you want me to completely waste your legs or waste your third leg?”

She is a genius surgeon doctor in Modern Era that was transmigrated into the body of the Eldest Miss of Lin Family.

He is a famous prince that named as the God of War and was feared by many.

“I, Lin Chujiu, am not a good woman. I do not know how to write melodramatic words.”

“I am in love with you and willing to do anything for you. I will bear the blame of our country or even help you seize the vast territory of our motherland…”

“I hate you, I am willing to pull out your heart, take out your bones and after you lose your life I will destroy this picturesque country…”

- Description from Novelupdates

“What! The young master has married another concubine?”After Gu Changge is bound to the system, sharing innate talent and even cultivation results with a Daoist Couple (wife) is possible. Whether it's consuming elixirs or treasures from heaven and earth, or from daily cultivation, everything can be shared!“Just by binding with one partner, I went from a waste to a spiritual body. What if I had multiple partners?”Since that day, he realized that working hard in cultivation was not as effective as taking in more spouses, and that taking elixirs himself was not as good as feeding his wives!The aloof and warm-hearted sect's holy maiden, the playful imperial princess, the dragon race's transformed girl with white hair...【Your Daoist Couple has cultivated through the night, shared cultivation progress!】【Your Daoist Couple has grasped the essence of swordsmanship, shared insights!】【Your Daoist Couple has consumed a supreme snow lotus, comprehended a law, shared!】【Dual Cultivating with your Daoist Couple, rewards...】(Disclaimer: Dual Cultivation is a unique method of cultivation where a man and a woman cultivate together by having sex)As he feeds his wives every day with ease and pleasure, he unknowingly becomes a celestial being, perfects the holy body, and stands above all living beings!(The story is focused on daily life, is lighthearted with a touch of humor, and does not stress the protagonist)