The film opens in 1976. A young boy, Yangyang, is growing up in Beijing with his mother and his stern, emotionally distant father. The father, a former political prisoner, is determined to mold his son into a disciplined, successful painter — forcing him to practice art endlessly, often with brutal severity. As the years pass, Yangyang grows into a rebellious teenager and eventually a successful artist living abroad. But his return home forces both father and son to confront decades of resentment, unspoken love, and the heavy price of ambition.

Sunflower (original Chinese title: Xiang Ri Kui ) is a poignant family drama spanning three transformative decades in modern Chinese history — from the Cultural Revolution in the 1970s to the economic boom of the 1990s. The story revolves around a father, a son, and their deeply strained yet loving relationship.

However, there are two well-known films from 2006 with "Sunflower" in the title, so I'll cover both briefly and then provide a full write-up for the most likely one. Write-up:

It seems you're looking for a (description, summary, or review) for the film often referred to as Sunflower (2006).