Double Identity: [Rich/Poor] or [Impersonate Sibling]

Dramas where one of the leads intentionally or unintentionally has two identities; this could be because they want to escape their responsibilities as an heir to a wealthy family or because they got amnesia and forgot who they used to be, etc.

The double identity could be the lead living as their normal rich self (main identity) but pretending to be poor (second identity) or it could be that the lead is forced to live as someone else, like their sibling/relative.