One Piece: My Crew is from Other World - Chapter 68: Found the Clue, Stupid Ace!

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

Her first encounter with Qin Sijue is an unexpected one. While trying to hide from her pursuers, she accidentally barges into his changing room. Yet, their paths crosses again fatefully—after a fake marriage, she legally becomes his bride. She imagines that they will only interact before the agreement ends, after which they would have nothing to do with each other. However, Qin Sijue comes over with two red booklets—their wedding certificate. “Take them for an appraisal and see if they’re real”.

Just as nuclear weapons are only a byproduct of scientific exploration, immortality is merely a small gift along the path of seeking the Dao. The New Dao Master, Grand Wise Teacher, and the strongest cultivator in millennia, Real Person Zheng Fa, is recruiting a personal disciple. The reference materials for applicants are as follows:Topology in Talismans: Starting with the Little Rain TalismanResearch on Artificial Intelligence in Magical Tools: A Preliminary Exploration of Tool SpiritsElemental Decomposition of the Nine-turn Golden PillBasic Pathways of FormationNote: Priority will be given to those who have published papers in the Immortal Dao journal.