I guess Rizwan does not know the ultimate end game of this mission as he only knows there would be few tasks given to him , time to time to execute to fullfill the mission. Moroevr his character clearly mentioned - Kal mera pehla assignment hai is mission ke liye. Assignments are part of the mission I guess. He would be informed accordingly what to do and how to do. as shown in many other fictions, the participants in these acts work in scattered manner and as in striated forms, the instructions are given. That's why Sana knows Rizwan's identity but don't know why he is part of the mission or for that matter she did not evn knew that this Atif guy attacked Hoodas. coming to what he is doing for last four years, I guess leaking information from the defence ministry through Hooda's business in some form or other. That's why He gave a pen drive to Sana when the family was visiting Nainital. Moreover that paanwala said that he vists Sana's place often for last many years, I hope that's not for some romantic hangouts and secret love affairs. Nazdeekiyon ki use izazat nahi.
baki toh Ekta mata ka show, jis me research zero level ka hota hai,memory loss is a daily problem for writers. Aur unpe kab kya bhooth sawar ho jaye. Nahi toh how can you forget that whole chaabi gum ho gayi nonsense on Tuesday and Rizwan's speaking like 70's ka hero - aaj saari hadh e paar kar deeni hai. What nonsense and how cheesy! 🤣🤣🤣Toh is me zyada dimag lagana is injurious to health. 😆😆😆