I Ran Into the Campus Belle, and the System Said She Was a Fallen Immortal

[You've successfully infiltrated the demonic sect. The Righteous Cultivation System is now bound to you!] Su Yu had just started university when he saw an information panel suddenly appear before his eyes and fell into deep thought. [As a righteous cultivator, you must guide fallen immortals back to the righteous path!] Su Yu watched the campus beauty and class representative he'd chanced upon, unable to figure out why she was a fallen immortal. [Warning! An extremely dangerous demonic woman is nearby! Be extra careful this time. Do not let her lead you astray!] Su Yu looked at the childhood friend standing before him and couldn't help laughing. A demonic woman? Lead me astray? I, for one, want to see how she's going to make me fall! [P.S. Everyday life, romance, campus, lighthearted, harem, all ages.]