Constitutional reform is suddenly all the rage in Seoul. The rage comes from President Park Geun-hye, who is dead set against it. Yet the head of her own party and half of all lawmakers support changing things to give the prime minister more power – and the president a bit less.

South Korea has been here before, more than once. Constitutional reform (let’s call it CR) is less boring than it sounds. It’s about making democracy work better, so this stuff matters.

...