My Stepmom's Daughter Is My Ex (2022)

High school is meant to be a fresh start, especially after a tough middle school romance. But for one student, that dream shatters when his ex becomes his stepsister at the same school. What should have been a peaceful escape turns into a daily reminder of their tumultuous past, with her everywhere he turns—home, school, and classes. To make matters worse, she insists she's the older sibling. Determined not to back down, he embraces his role as the big brother. The bond they once thought they had is gone, and their new family dynamic will never be the same.