I think you may have confused the drawing of the K-line chart with the color of the increase and decrease.

In my country's stock and futures markets, the rise or fall of today's closing price is compared with yesterday's closing price. If today's closing price is higher than yesterday's closing price, it will be colored red to indicate today's rise; if today's closing price If it is lower than yesterday's closing price, it will be colored green to indicate today's decline.

In the drawing of the K-line chart, only four prices of the day are considered: the highest price, the lowest price, the opening price and the closing price.

The highest price is the apex of the upper shadow line, and the lowest price is the endpoint of the lower shadow line. These two are easier to understand.

Today’s opening price and closing price are relatively difficult. If the entity of the K line is red (the so-called Yang line), it means that today's closing price is higher than today's opening price, so the upper side of the red entity (that is, the rectangle itself, regardless of the upper and lower shadow lines) represents today's closing price, and the lower side The side represents today's opening price. On the contrary, if the entity of the K line is green (the so-called negative line), it means that today's closing price is lower than today's opening price. Then the upper edge of the green entity is today's opening price and the lower edge is today's closing price.