A Pyeong describes in Korea a square measure of 3.31 m², which is preferably used for homes and residential space. The apartment sizes in South Korea range from 1-2 Pyeong ( student room ) to 50-60 Pyeong (luxury apartment).
The origin of the Pyeong is in Japanese Wohnflächenmaß Jō (Japanese畳), which corresponds to the default size of the tatami mats.
When Korea was under Japanese rule, the Japanese units in Korea were introduced by the Japanese. So also the tsubo (Japanese坪), ie after independence from Japan in the Korean reading of the Chinese character Pyeong.
So was it when Taiwan was under Japanese rule and also the unit is Ping (Chinese坪) throughout the real estate sector the only common calculation unit. Figures in square meters are difficult or impossible to obtain.
In 1891, the unit of length Ken (Japanese间) with exactly 20/11 meters was set in the Japanese Shakkanhō system of measurement. The derived from the Ken Japanese unit area tsubo (Japanese坪) corresponds to a square of side length 1 Ken.
1 Pyeong = 1 tsubo = 1 Ken ² = 2 Jō = 400/121 ≈ 3.3058 m² m²