Check what has changed since the first attempt
Shared history matters most when the premise explains why a relationship or opportunity failed before. Look for a concrete change: new information, a different boundary, a changed responsibility, or a decision to acknowledge past harm. A reunion and a convincing opportunity to rebuild are not automatically the same thing.
Does second chance always mean a former couple?
No. The idea can also describe a renewed opportunity or a broader fresh start, depending on the title's tags and synopsis. If you specifically want a romance with shared history, check for a romantic relationship in the premise rather than relying on this label alone.