Karan Johar has launched many star kids in Bollywood and this year, Sridevi's daughter Janhvi Kapoor and Shahid Kapoor's brother Ishaan Khatter will be making their big Bollywood debut with Dharma Production's Dhadak. But before their debut, mentor Karan Johar has written an emotional letter for Janhvi Kapoor and ishaan Khatter. Karan said, "It's a new year which means new beginnings and time for new relationship goals. Dear Janhvi and Ishaan, you are going to embark on a new journey of stardom this year. You will face many firsts in 2018 from promotion to paparazzi to link-ups and trolling to fame and failures. You are going to see it all." Know more about Karan's this emotional letter in this video.