Introduction to Mikami Sungbun: Mikami Sungbun was the "bathroom" in the past. There are four eye-catching large characters "Mikami Sungbun" on the lintel of the bathroom. The "three on" refers to the pillow, the horse, and the toilet. The ancient writer Ouyang Xiu has a very famous saying of "Three things to write". At that time, the Kang family adopted Ouyang Xiu's method to decorate a study room scene in the toilet, using the ancient proverb "an inch of gold cannot buy an inch of time" to spur themselves on and educate themselves. The descendants read and learned, and actively used their little leisure time on pillows, horses, and toilets to write manuscripts and articles. The Kang family used this to urge their descendants to seize the time to study and make progress.