Sweet 20 (Vietnamese: Em là bà nội của anh; lit.

'you are my grandmother') is a 2015 Vietnamese fantasy romantic comedy film directed by Phan Gia Nhat Linh and starring Miu Le, Ngo Kien Huy, Hua Vi Van, Minh Duc, Thanh Nam and Hari Won.

Mrs. Dai is a 70 year old grandma who is living with her only son Quang and his family including his wife Vy, two grandchildren Nhon and Tung.

During this time, a TV channel is looking for new talents as producer Manh Duc and his assistant Min Ji have been searching for the best voice out there, however, nothing has progressed.

Tung's musicband have an opportunity to perform in a liveshow, Thanh Nga sings "Con tuoi nao cho em" which greatly touches the audience.

Next day, Manh Duc and Min Ji take Thanh Nga, Mr. Be, Tung and his band to the pool.

Thanh Nga has to temporarily sleep at Manh Duc's house which makes Tung jealous without knowing that is his grandmother.

Thanh Nga will be performing "Minh Yeu Tu Bao Gio" which is composed by Tung before heading off to the hospital to check his situation.

The movie ends as Mrs. Dai steps out of the theater and happily smiling as she stares at Manh Duc.