Is an agreement written on plain paper legally enforceable

Sir i & my friend make a plain paper agreement (not on stamp paper not reg. Anywhere) tht i will pay him 10 lac. But due to some reason i cant give him money. Whn aggrement write down he make video recording of tht aggrement writing time. On this plain paper with political pressure police reg case FIR under 420 120. Bcz in 2014 he trf 3lac in my bank a/c but in 2017 i trf 2lac in his a/c. No any other written commitment. So sir i want to know is tht plain paper aggrement is valid with video recording in court to pay amt written in aggrement. Interesting thing is on 1 side plain paper all terms written abt money but on 2 reverse side on paper is tht" i m agree to liable this agreement " & sign but on 1 side on sign. will it say 1st side is not known to me in court wht is written? Is plain paper agreement is legal doc. Against me with video recording to culprit me? Sir plz suggest me what i do thks