Why it worked
The video uses a popular game format (tic-tac-toe) with a visually engaging element (colored liquids in star-shaped bottles) to create a simple, satisfying, and easily shareable piece of content.
Summary
A man and a woman play a game of tic-tac-toe using bottles filled with black liquid and clear liquid. They take turns placing their respective colored liquids onto the tic-tac-toe board, with the goal of getting three in a row.