A Little Red Flower (2020)

The movie have same story about a child who suffers from an illness, both of them have warm families who are willing to sacrifice for their children

Both movies have the same male lead (Yi Yang Qian Xi/Jackson Yee), if you want to see more of him and his works, Better Days is a good recommendation. Both movies are heavy/emotional and deal with real life issues (bullying and living with terminal illness).