Deadly and Dangerous Bad Guys

Aside from the threats that the ML originally hires the FL to protect him from, there is a darker and more sinister person that the leads must fight against to save several lives. 

Even when all of the attacks against the ML, FL and SML are caused indirectly through other dangerous people, the leads must stop the person who is behind it all.

The ML and FL become targets of a killer when they discover the truth behind a bitter betrayal that broke apart the happy lives of their families.

Still haunted by the tragic events that happened to both of their mothers when they were children, the FL and ML must finally face the person that was responsible for their traumas. 

When the past and present of the ML and FL starts to converge, the leads discover that someone is determined to destroy them once again.

With the threat of a serial killer still on the loose in their small town, the ML must find that person before the FL becomes another victim.

Tragedy strikes the FL over and over again when she is the target of resentment and greed, and the ML is tasked with being her guardian angel and confronting those trying to harm her.

While the FL tries to uncover her identity and how she became a spirit, a dark entity that has been after the ML since he was a child is now seeking to destroy them both before they learn the truth.

After the FL gets swept up in a horrible death scandal involving her rival, the ML must protect her, and his identity, from being the next target of the actual killer.

Many years after the murder of the ML's father, the FL is now in danger for being the witness that caused the killer's conviction, and the leads must try and stop the killer once again.