My Coldhearted Archrival Turned into a Jealous Puppy

After transmigrating to an unfamiliar world, Shi Yuan struggles through more than three hundred days and nights before finally faking her death successfully and returning to the real world. The moment she holds her phone again, she almost cries with joy: Goodbye forever, inedible black bread! Goodbye to endless balls and afternoon tea! Goodbye, Adrian, the rival who was always at odds with her! She thinks she can finally live in peace, but on the first day of school, all her joy at surviving vanishes. Why does the new transfer student, Li An, have a face identical to Adrian's?! Could that bastard be so obsessed that he chased her all the way into the real world to kill her? Old grudges and new anger surge through her. After class, Shi Yuan corners him in a quiet alley and lands a solid punch on his face. "Adrian, you creepy stalker! Why won't you leave me alone?" Li An covers his face in confusion, his moist eyes full of hurt. "Are you sure you've got the right person?" Shi Yuan: ? In the days that follow, she investigates, asks around, and tests him at every turn, yet she can't find the slightest trace of Adrian in Li An. She starts to have doubts. Could she really have mistaken him for someone else? Then, one rainy day, she spots Li An crouched alone beneath the eaves, sheltering from the rain like a stray puppy. Remembering everything that came before, she can't help but soften. Almost without thinking, she steps forward and holds her umbrella over him. "Want to walk home together?" Li An nods gently, lowers his lashes, and presses his lips into a shy smile. Shi Yuan is now completely certain this guy isn't Adrian. That bastard would never make such a revolting expression. But she doesn't see the moment Li An's smile vanishes as she turns away. His eyes follow her retreating figure, all that familiar coldness returning to them. Reader's Guide: 1. Neither the male nor female lead is perfect. 2. My take on Western fantasy (with a quasi-medieval setting) + an alternate modern world. A deliberately fantastical, chuunibyou-style story, so please don't nitpick the details. 3. A lighthearted, sweet 1v1 romance. Every plot point and setting serves the romance. 4. The heroine's actions early on are only meant to test the hero's identity, not to bully him at school. Theme: Love one another