Quick Transmigration: I Got a Happy Ending with the Male Supporting Lead

[Quick transmigration + sweet romance + happy ending + one-on-one]

The first world is a little silly. If that's not your thing, feel free to skip straight to world two~~^_^

Eighteen-year-old Sang Yu is sitting in a university classroom reading a novel. She looks up at the baffling calculus on the blackboard and can't help sighing: Life is so boring. I wish I could experience the worlds in novels.

The System, Qianlai, hears Sang Yu's thoughts and decides: You're the one!

And so Sang Yu transmigrates... into different worlds, supposedly to save the male supporting character, Jiang Guanghan, and collect fragments of him?

At first, Sang Yu thinks: Not having to go to school is so much fun! [Happy]

Later, Sang Yu is exhausted: I want to go back and study calculus! [Crying]

Jiang Guanghan pulls Sang Yu tightly into his arms, his tone fierce: Keep dreaming!