Bollywood actor Arjun Kapoor has penned an emotional note and words of encouragement for his step sister Janhvi Kapoor , the trailer of whose maiden film "Dhadak" is releasing on Monday. "Dhadak" , produced by Karan Johar and directed by Shashank Khaitan , will also mark the Bollywood debut of Ishaan Khatter , step brother of actor Shahid Kapoor.
