Quick Transmigration: The Sweetheart Is a Boy

To meet the person he loves again, Lin Zhiwen joins the Bureau, only to discover that his beloved is long gone and the Bureau's higher-ups are all searching for her. Lin Zhiwen tells the higher-ups what he's decided and sets out to find the one he loves.

But why are all the worlds his beloved protects so unusual?

World One: The CEO's Secret Lover

World Two: The Naughty Immortal Lord's Obedient Disciple

World Three: The Rabbit Spirit and the Cold, Aloof Demon Hunter

World Four: The Mermaid's Devoted Sea God

World Five: To be decided...

Feel free to suggest other worlds in the comments. I'll consider your ideas.

One-on-one romance, with both leads doting on each other.