So she isn't dead yet. I think the solution is easy: frame Gang-ok. Tell them she doesn't know who the Vigilante is because this billionaire psychopath who's an expert in close-quarters combat and has an IQ of 200 acts as the middleman between her and the Vigilante. It's great payback for the stolen kiss and let Mr Bang and Soedol square off against the Imilante.
Not that Mr Bang will let her go if she sings, but at least he may give her a quick death.
Also, everyone's double-crossing everyone else. Eager here to see who's gonna draw the short stick.