“Back to 20” tells the story of a 70 year old lady (Gui Ya Lei) transformed into a magical 20-year-old young girl (Yang Shan), with its new identity back to everyday life, triggering a series of ridiculous stories : She regain music dream, and met again several men love, and different age groups: high cold Music Director (Chen Bo Lin), grandson (Lu Han), grandfather magical electric shock. The movie is the Chinese version of the hit Korean film, “수상한 그녀” (“Miss Granny”).