Another theme is likely to be redemption. Maybe one of the characters has a dark past or is involved in bad things, but through the power of love in this dangerous situation, they strive to redeem themselves. The story could show how love can be a catalyst for change in a dangerous context. Also, the theme of survival could be present. Since it's a dangerous love story, the couple or the characters in love may have to fight for their survival against all the odds that the danger presents, whether it's physical danger or threats to their relationship.