Back to 20 is a Remake of the Korean hit film "Miss Granny" also known as "Suspicious Woman" or "Soosanghan Geunyeo" both movie's can be watched on the site called dramanice.at there's also a Japanese version called "Ayashii Kanojo" but I have not seen that one yet to compare it with the other two. BELOW I'LL TALK ABOUT BOTH THE KOREAN ORIGINAL FILM & THE CHINESE REMAKE! Back to 20 is about a women by the name of Shen Meng Jun who is a crotchety prideful 70 year old widow who get's transformed into a 20 year old and uses the name Meng Li Jun as her new identity then proceeds to meet several handsome young men. One of them just so happens to be her grandson Xiang Qian Jin who is played by Lu Han. (and by god I honestly had no clue he was in the movie until I saw him appear on screen and had to come back and look at the details). In Miss Granny which is the Original Film we have a An elderly 74 year old woman by the name of Oh Mal Soon who is Foul-mouthed, stubborn, controlling and shameless, who suddenly regains her youthful appearance, then changes her name to Oh Doo Ri and embarks on a quest for happiness Now BOTH version are a little bit different YES it's basically got the same plot and setting but the scenes aren't exactly the same and things DO happen differently then they did in the other film plus both endings are totally different (I'm gonna stop here before I spoil anything).