A family saga between twins in a story of betrayal, sacrifice, and forgiveness. Based on the bestselling novel by Wally Lamb,and adapted and directed by Derek Cianfrance, I Know This Much Is True starring Mark Ruffalo premieres May 10. #HBO #IKnowThisMuchIsTrue #IKTMIT Subscribe to HBO on YouTube: https://goo.gl/wtFYd7 Watch Now HBO NOW: https://play.hbonow.com HBO GO: https://play.hbogo.com Get More HBO Official Site: https://www.hbo.com/ Twitter: https://twitter.com/hbo Instagram: https://www.instagram.com/hbo Facebook: https://www.facebook.com/hbo I Know This Much Is True: Official Teaser | HBO