The Mysterious Heiress: Researcher In Disguise - Chapter 763 - Fantasy Side Story, ye ze:

In his past life, he climbed to the 69th floor, and reached the limit of his potential.

Now, reborn, he has returned to the past, when the almighty Tower first summoned him. He will work his way up again, step by careful step.

This time, he will climb to the top.

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There are quite a few time travels in these years, but he is probably the first one who suddenly and inexplicably time travels during the execution of a mission. A new world, a new beginning, may be the best result for him. but……
Animals transform, well, he’s calm.
There is no woman, well, he is calm.
As a female, she still needs to marry a guy who can transform…Calm down, draw your knife, and prepare to kill someone.
“Ah Liu, calm down, calm down, help~~~”

Content tags: Another World Continent Qiangqiang Shengzi Sweet Text
Search keywords: Protagonist: Ah Liu, Cedric ┃ Supporting roles: Phil, Adolf, etc. ┃ Others: Orc, time travel, strong

- Description from novelbuddy

A very sweet entertainment circle novel about a closeted gong x fudanshi shou.

- Description from Novelupdates

Xiao Ran transmigrated to a fantasy world. As a dungeon guard in the Celestial Dungeon, with a special floor called the Purgatory meant for powerful demons and martial arts experts, he faced a huge challenge from the start. The Eldest Princess acquired a forbidden martial arts technique and was banished to the Purgatory. However, no one was powerful enough to restrain her. All the dungeon guards were defeated. Xiao Ran stepped up and declared, “Your Highness, it’s better for you to behave yourself on my territory” and effortlessly subdued the Eldest Princess.

He progressed from imprisoning the Eldest Princess to delivering the Great Xia Kingdom from the evil clutches of various demons and evil martial arts experts.

…

Xiao Ran was the mastermind behind the scenes.