Option A is an au where instead of breaking into sangwoos house, yoonbum decides to actually ask him out and when discovering that sangwoo is a killer, joins him.

Option B is sangwoo is actually the in stalking yoonbum and kidnaps him

Option C is that instead of it being torture, yoon and sangwoo are just in a really kinky relationship. Everything else is the Same though

Option D is like black butler, where my Oc is a demon and makes a contract with yoonbum

Option E is my Oc is a therapist that yoonbum sees after getting free from sangwoo

Option F is a transfer student idea. My Oc goes to Korea to study abroad and gets kidnapped by sangwoo only to easily escape with Yoon

Option G is when yoon tries to escape that first time, my oc actually does find him and help him

Of course we'd incorporate your Oc and sangwoo into the ones that involve my oc if you wish