1552. This #kanjipuzzle is about evolution. Start with one character, add a few strokes, and get another, then repeat. 一 -> ? -> ? -> ? -> ? -> ? -> ? -> ?

Answer:

一 -> 十 -> 干 -> 王 -> 全 -> 金 -> 針 -> 錬

一  ICHI, ITSU, hito(tsu) - one

十  JUU, tou, to - ten

干  KAN, hi(ru), ho(su) - get dry, dry, drink up

王  OU - king

全  ZEN, mattaku - all

金  KIN, kane - gold

針  SHIN, hari - needle

錬  REN - temper, forge, polish, refine, drill