The Cold Prince's Iceberg Princess

They were supposed to be four happy princesses and kings. However, due to a twist of fate, someone broke the tranquility and caused the death of both their parents. In desperation, they lingered on the edge of death, and finally they all became the kings of the underworld. It's frightening. Now, they are back, and they are back for revenge. They were strangers, but fate brings them together. What kind of sparks of love will spark between them? How will they take revenge... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.