I'm not quite sure but somehow he pulls her father into some guilt trap then he pierce his hands into hayan father hearts. The moment when hayan and her mother found her father, his chest already has a hole and hayan mother use her abilities to locked hayan memories I guess and order her to run away to protect hayan. When her mother found yohan he already got this new superpower almost like pureblood which means he must have ate hayan father heart. And kill hayan parents
I'm so sorry for the spoilers I read the raw ones but I dont understand the language I just read the artwork. And simply calculate all the spoilers that people give with the artwork.

Spoiler beware
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Before 10 yrs there was no vampire manifestation. Only pure bloods existed and that too very very few in number. Actually just 2 I guess. Anyway Hayan's childhood friend Yohan was badly injured in an incident and was about to lose his life so Hayans dad gave him his blood and converted him into a vampire. But still he was not as strong as the purebloods so killed her parents and completely drained their blood. Now he wants her gone too so he can be the ultimate God and no one can defeat him. Yohan created his own army of vampires who are all hybrids. So he is the one who started this all. That asshole. Anyway in this chapter he just faked his death to avoid being doubted and also just to see Hayan cry. He is a sadistic bastard.