A girl travels back in time and finds that her grandpa is a psycho and witnesses him murder another girl in his garden.
1 Answer
This is Garden of the Dead Flowers.
When Mila woke up, she suddenly returns to the past in Batavia during the Dutch colonial period. She accidentally saw her grandfather at a young age, kill a girl! Her grandfather, who she thought was nice, actually killed girls in his garden and planted them into flowers.