Teen actress Kathryn Bernardo is not one to watch horror films.

She confesses to being "duwag," or a scaredy cat, when it comes to seeing gruesome and creepy flicks that toy with her imagination.

So when Regal Films included her in the 13th installment of the Shake Rattle and Roll movie franchise, the star of Mara Clara (2011 remake) had to toughen up.

The official Monteverde movie entry to this year's Metro Manila Film Festival (MMFF) casts a powerhouse of actors in its typical three-story thriller.

Among them are Eugene Domingo, Jay Manalo, and Edgar Allan Guzman for the first episode 'Rain Rain Go Away.'

The second episode 'Tamawo' stars Zanjoe Marudo, Maricar Reyes, and Celia Rodriguez.

Kathryn is cast alongside Dimples Romana, Sam Concepcion, Louise delos Reyes, Ina Raymundo, Ara Mina, Julia Clarete, and Hiro Magalona in the third story, 'Parola.'

After proving her knack for drama in her soap opera and first film, Way Back Home, the 15-year-old was willing to make the most out of this yearender project by enduring the sudden shift to horror.

What was the first thing she had to endure exactly?

Thrilled, Kathryn is quick to utter: "Kasi sobrang takot ako sa mga uod!

"Tapos marami pong scene na may kasama akong mga worms na totoong natatakot talaga ako dun.

"Yun yung pinaka-nahirapan ako... umiiyak talaga ako habang nagshu-shoot kami."

While that part frightened her immensely, Kathryn relays that nothing was more challenging for her than actually acting scared.

"Sa akin, nahirapan ako kasi yung kailangan mo matakot talaga [kahit] na alam mong hindi totoo yung mga yun.

"Kailangan galingan mo pag-arte mo para maging effective," states the pretty morena.