There is a movie about three children learning martial arts from an old man. If you know the name of the movie, please tell me the title. Thank you.

"Good Boy: Little Dragon Comes Out of the Mountain" Although the three brothers A Guo, Xiao Hu and Xiao Pang are young, they live in seclusion in the mountains and receive Kung Fu lessons from their grandfather, so they all have very good boxing and kick Kung Fu. Live happily isolated from the world. But unfortunately, the third child accidentally let go of Grandpa's beloved pet Little Skylark. In order to avoid being punished by Grandpa, he decided to go down the mountain and seek refuge with his grandma who lived in the metropolis. The three children had never been to the civilized city at the foot of the mountain. Therefore, after arriving in this colorful metropolis, they were extremely curious about everything and made constant jokes. Because the old banknotes brought by the three primary schools could no longer be used. , but had no clue about finding her grandma, so she wandered on the streets. The drug cartel saw that the three young men were ignorant but had a lot of skills, so they pretended to take care of her and wanted to use her to commit crimes. The third child did not investigate at first, but later discovered the conspiracy, so he escaped and was rescued by his grandma by chance. After returning home, I found out that it was my grandson, and I was very happy. Unexpectedly, the drug cartel was afraid that the police would seize the criminal evidence that Sanxiao had taken away, so they kidnapped their granddaughter in exchange. Sanxiao went to negotiate privately and started a fight. In the end, they were outnumbered. At the critical moment, Grandpa arrived in time. , to save the four little ones from being poisoned. After grandma also called the police at this time, a large number of police personnel arrived and brought the gangsters to justice, and the five grandparents and grandchildren were finally reunited happily.