Why it worked
The video leverages the strong brand recognition of Disney characters and the satisfying ASMR-like process of coloring by numbers, appealing to a broad audience interested in art, crafts, and nostalgia.
Summary
The video shows a person coloring in a Disney "Les Grands Classiques" coloring book, specifically Tome 4, page 35. They use various markers and paint pens to fill in the numbered sections of the illustration, revealing a character that appears to be Belle from Beauty and the Beast. A list of color codes is shown at the end.