He worked as a general manager at the Yuanlong Tea Company in 1923, and played a significant role in shaping Hung's artistic upbringing.
Under the influence of various streams of thought, Hong Jui-lin's creative content started to focus even more on the daily lives of workers, farmers, and small-town residents.
He often brought small pieces of paper, ink stored in film canisters, and simple brushes into the dark, damp, and hot mine to quickly sketch scenes of the miners' work.
Hung's paintings depict the miners' muscular bodies and movements with simple and rough black ink lines.
He painted "Japanese Slums" in 1933 and "Yamagata Market" in 1937, both depicting the difficult lives of Japan's underprivileged people.
"[9] "During my years of studying in Japan, what moved me the most were not the cherry blossoms or the clear streams, but the laborers working in the cold weather.