My guess is homicide/suicide.... Because they say the females can kill their mates... my guess the mom killed the dad then killed herself when she found out she kill him... it will be interesting if they give us an explanation... which I hope they do..
After reading ch 92, I'm pretty sure the lycan leader killed them
I don't know about this... I guess the one who's capable of killing their mates are the perfect lycans (mutants that was born from female x female lycans) like Seolhyun. That's why people are worried about Seolhyun and Hwa because they know Seolhyun might went out of control and at one point will kill Hwa.
So I'm curious how seolhyuns parent died